<![CDATA[Lower Secondary Mathematics]]>Hi everybody. Can anyone help me to solve these problems?


1) Two types of coffee, P and Q, are blended in the ratio 3:13 by weight to form a standard blend X. A second standard blend Y, is formed by blending type P coffee, type Q Coffee, and type R coffee in the ratio 1:7:12 by weight.
Calculate,
(a) the ratio of the three types of coffee in a third standard blend Z, formed by mixing equal weights of X and Y. (ANS- P:Q:R= 19:93:48)
(b) the weight of type P coffee in 800g of Z. (ANS- 95g)

2) Peanuts sell for $3 per round. Cashews sell for $6 per round. How many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.2 per round? (ANS- 8 pounds)

3) Steven left Town A and walked towards Town B at a speed of 100m/min. At the same time, Jason and Melvin started from Town B and walked towards Town A at a speed of 80m/min and 75m/min respectively. If Steven met Melvin 6 mins after passing Jason, find the distance, in km, between Town A and Town B. (ANS- 37.8km)

Pls help. :hugs: :thankyou: .

]]>https://forum.kiasuparents.com/topic/71476/lower-secondary-mathematicsRSS for NodeFri, 01 May 2026 04:49:26 GMTWed, 20 Mar 2013 07:23:18 GMT60<![CDATA[Reply to Lower Secondary Mathematics on Fri, 23 Sep 2016 14:58:27 GMT]]>Moderator's Note: Dear all, we have decided to lock this thread as we would like to encourage the use of https://www.kiasuparents.com/kiasu/askq/ for the posting and answering of academic questions. By using AskQ, each question can be given very specific treatment and it makes it much easier for readers to track and follow discussions which enhances learning and understanding. At the same time, members who answer questions will be duly rewarded with KiasuPoints$ as a small token of appreciation, simply by users who liked their answers, or by the person who asked the question accepting the answer. Thank you, and see you in https://www.kiasuparents.com/kiasu/askq/!

]]>https://forum.kiasuparents.com/post/1720687https://forum.kiasuparents.com/post/1720687Fri, 23 Sep 2016 14:58:27 GMT<![CDATA[Reply to Lower Secondary Mathematics on Fri, 23 Sep 2016 04:19:36 GMT]]>Moderator's Note: Question moved to https://www.kiasuparents.com/kiasu/question/dear-allneed-your-assistance-on-the-following-questionthe-price/.

]]>https://forum.kiasuparents.com/post/1720601https://forum.kiasuparents.com/post/1720601Fri, 23 Sep 2016 04:19:36 GMT<![CDATA[Reply to Lower Secondary Mathematics on Mon, 05 Sep 2016 11:42:16 GMT]]>Moderator's Note to Tutors: Please do NOT post answers that merely contain links that point to your own websites. Our academic support threads are not intended for you to advertise your sites. KiasuParents.com needs to store a copy of your answer to questions so that it can always be found by future students as a reference. If you are not prepared to do so, please do not make any post because non-compliant posts will be deleted without notice.


Thank you.

]]>https://forum.kiasuparents.com/post/1716871https://forum.kiasuparents.com/post/1716871Mon, 05 Sep 2016 11:42:16 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 04 Sep 2016 14:43:48 GMT]]>Moderator's Note: Please use our new AskQ platform for asking and answering your academic questions. This question has been moved https://www.kiasuparents.com/kiasu/question/16325-2/. Thank you.

]]>https://forum.kiasuparents.com/post/1716661https://forum.kiasuparents.com/post/1716661Sun, 04 Sep 2016 14:43:48 GMT<![CDATA[Reply to Lower Secondary Mathematics on Fri, 26 Aug 2016 07:58:32 GMT]]>

Sruthi:
http://i67.tinypic.com/2ns2j2e.jpg\"> can anyone please help me with this question.thank you in advance :salute:

https://ask.manytutors.com/questions/158

Here you go...

]]>https://forum.kiasuparents.com/post/1714033https://forum.kiasuparents.com/post/1714033Fri, 26 Aug 2016 07:58:32 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 17 Jul 2016 12:53:01 GMT]]>

EC72:
http://i64.tinypic.com/vqnmtd.jpg\">


Could anyone help me with this question? Thanks in advance.
http://i64.tinypic.com/jkvg9h.png\">

]]>https://forum.kiasuparents.com/post/1699663https://forum.kiasuparents.com/post/1699663Sun, 17 Jul 2016 12:53:01 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 17 Jul 2016 10:46:58 GMT]]>http://i64.tinypic.com/vqnmtd.jpg\">


Could anyone help me with this question? Thanks in advance.

]]>https://forum.kiasuparents.com/post/1699632https://forum.kiasuparents.com/post/1699632Sun, 17 Jul 2016 10:46:58 GMT<![CDATA[Reply to Lower Secondary Mathematics on Wed, 29 Jun 2016 01:49:52 GMT]]>

MyPillow:
Sec 1 math has quite a fair bit of algebra , which I prefer.

Ds told me his class mate use psle model method to solve the story sum
Teacher gave that boy Zero ! Recall back, pri kids spends so many yrs
On hateful model , ended up not allowed in sec sch - Wat happen to math syllabus ? Pri n sec no linkages , why make the pri kids \" suffer \" so much nei :scratchhead:

This is the very reason why I always encourage students to pick up algebra at Primary 5 if they are competent, or Primary 6, to mitigate the loss of marks due to inability to draw models.


Regards,
Eric
passioninlearning.wordpress.com

]]>https://forum.kiasuparents.com/post/1693945https://forum.kiasuparents.com/post/1693945Wed, 29 Jun 2016 01:49:52 GMT<![CDATA[Reply to Lower Secondary Mathematics on Wed, 22 Jun 2016 05:40:17 GMT]]>

MyPillow:
Sec 1 math has quite a fair bit of algebra , which I prefer.

Ds told me his class mate use psle model method to solve the story sum
Teacher gave that boy Zero ! Recall back, pri kids spends so many yrs
On hateful model , ended up not allowed in sec sch - Wat happen to math syllabus ? Pri n sec no linkages , why make the pri kids \" suffer \" so much nei :scratchhead:
Hi Mypillow,

There is a link between model and algebra actually. To certain extent, model is indeed a simplified pictorial presentation of algebra.

Primary school students cannot understand algebra well as it is quite abstract. So we use model approach to help students in understanding and visualising the questions.
However, model approach has its limitation as it is a simplified substitution of algebra. Therefore, teachers in secondary school insist that the students need to learn the more advanced and proper algebra, rather than always stick to model.

Cheers!

]]>https://forum.kiasuparents.com/post/1691947https://forum.kiasuparents.com/post/1691947Wed, 22 Jun 2016 05:40:17 GMT<![CDATA[Reply to Lower Secondary Mathematics on Wed, 22 Jun 2016 05:32:23 GMT]]>

cftan:
Need help on this question.


The price of a sofa is $x. A man buys the sofa on hire purchase according to the following terms: a downpayment of 25% and the remaining to be paid in monthly installments over 30 months at a simple interest rate of 12% per annum. Given that his monthly instalment is $52, find the value of x.
http://www.fa.edu.sg/wp-content/uploads/2016/06/img_20160622_132506-e1466573371840.jpg\">

Please let us know if you need further explanation, our team of ex IP school/RGS/NYGH teachers are here to support you.

]]>https://forum.kiasuparents.com/post/1691945https://forum.kiasuparents.com/post/1691945Wed, 22 Jun 2016 05:32:23 GMT<![CDATA[Reply to Lower Secondary Mathematics on Thu, 16 Jun 2016 08:45:48 GMT]]>Need help on this question.


The price of a sofa is $x. A man buys the sofa on hire purchase according to the following terms: a downpayment of 25% and the remaining to be paid in monthly installments over 30 months at a simple interest rate of 12% per annum. Given that his monthly instalment is $52, find the value of x.

]]>https://forum.kiasuparents.com/post/1690366https://forum.kiasuparents.com/post/1690366Thu, 16 Jun 2016 08:45:48 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sat, 28 May 2016 12:57:26 GMT]]>Sec 1 math has quite a fair bit of algebra , which I prefer.

Ds told me his class mate use psle model method to solve the story sum
Teacher gave that boy Zero ! Recall back, pri kids spends so many yrs
On hateful model , ended up not allowed in sec sch - Wat happen to math syllabus ? Pri n sec no linkages , why make the pri kids \" suffer \" so much nei :scratchhead:

]]>https://forum.kiasuparents.com/post/1684542https://forum.kiasuparents.com/post/1684542Sat, 28 May 2016 12:57:26 GMT<![CDATA[Reply to Lower Secondary Mathematics on Tue, 24 May 2016 23:24:00 GMT]]>

blissful mummy:
Hi Piggylalala, really appreciate your clear and concise explanation, I get it now! Thanks v much for your kind help, really appreciate your time 🙂 Have a lovely week ahead!

Glad that I could help. U have a nice week ahead too. 🙂

]]>https://forum.kiasuparents.com/post/1683386https://forum.kiasuparents.com/post/1683386Tue, 24 May 2016 23:24:00 GMT<![CDATA[Reply to Lower Secondary Mathematics on Tue, 24 May 2016 12:49:23 GMT]]>Hi Piggylalala, really appreciate your clear and concise explanation, I get it now! Thanks v much for your kind help, really appreciate your time 🙂 Have a lovely week ahead!

]]>https://forum.kiasuparents.com/post/1683277https://forum.kiasuparents.com/post/1683277Tue, 24 May 2016 12:49:23 GMT<![CDATA[Reply to Lower Secondary Mathematics on Tue, 24 May 2016 12:22:28 GMT]]>

blissful mummy:
Is there a Math expert who can explain why the solution of the question:

In 2006, the price of one litre of petrol was $2.30. If the price of petrol in 2006 was 15% less than the price in 2005, calculate the price of one litre of petrol in 2005:
Is as follows:
Price of 1 litre of petrol in 2005 = 100/85 X 2.3 = $2.71

My question is: why is it 100/85 ( as in 100 divided by 85)?

Thanks so much!!! Really appreciate clarification on this 🙂
For questions on percentage, one has to be very clear of which quantity is equivalent to 100%, usually it is the original quantity or the quantity that we are comparing with will be 100%.
In this question,we are comparing the price of one litre of petrol in 2006 to the price in 2005. Hence 2005 price is equivalent to 100% and 2006 being 15% lesser, will be 85%.
Thus,2006: 85% - $2.30
2005:100%-$2.30/85x100=$2.71

]]>https://forum.kiasuparents.com/post/1683265https://forum.kiasuparents.com/post/1683265Tue, 24 May 2016 12:22:28 GMT<![CDATA[Reply to Lower Secondary Mathematics on Tue, 24 May 2016 12:12:46 GMT]]>Is there a Math expert who can explain why the solution of the question:

In 2006, the price of one litre of petrol was $2.30. If the price of petrol in 2006 was 15% less than the price in 2005, calculate the price of one litre of petrol in 2005:
Is as follows:
Price of 1 litre of petrol in 2005 = 100/85 X 2.3 = $2.71

My question is: why is it 100/85 ( as in 100 divided by 85)?

Thanks so much!!! Really appreciate clarification on this 🙂

]]>https://forum.kiasuparents.com/post/1683262https://forum.kiasuparents.com/post/1683262Tue, 24 May 2016 12:12:46 GMT<![CDATA[Reply to Lower Secondary Mathematics on Mon, 09 May 2016 07:35:27 GMT]]>Hi


Can someone help on this question? (Without using calculator, show the workings)

http://i66.tinypic.com/260su9i.jpg\">

]]>https://forum.kiasuparents.com/post/1677488https://forum.kiasuparents.com/post/1677488Mon, 09 May 2016 07:35:27 GMT<![CDATA[Reply to Lower Secondary Mathematics on Tue, 03 May 2016 01:03:32 GMT]]>

tankee:
Future Academy:

[quote=\"tankee\"]Kindly help with the following qn, thanks.

Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution

Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

......


likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.

thanks.[/quote]A quick sketch of the graph will show that there is a solution.
I believe that it's a typo, and it probably is on either of the gradient/x-coefficient of the 2 equations.

The explanation should be because the gradient of the lines are the same (-2 OR 2; unable to determine due to typo), that means the 2 equations are parallel to each other, and therefore will never meet each other. => no solutions.

]]>https://forum.kiasuparents.com/post/1675542https://forum.kiasuparents.com/post/1675542Tue, 03 May 2016 01:03:32 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 01 May 2016 15:26:14 GMT]]>

Future Academy:
tankee:

Kindly help with the following qn, thanks.

Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution

Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

......


likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.

thanks.

]]>https://forum.kiasuparents.com/post/1675186https://forum.kiasuparents.com/post/1675186Sun, 01 May 2016 15:26:14 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 01 May 2016 14:14:22 GMT]]>Need help with the following questions:-


1) 10f2 - 15f = 0

17g + 45
2) g2 + ----------- = 5
2

Not sure how to place the superscript of square thus f2 and g2.

Question 2 is truncated.

Anyone can tell me how to upload the in pic? Cos has reduced size many times and change from bmp to jpg and etc still cant post..... :gloomy:

]]>https://forum.kiasuparents.com/post/1675157https://forum.kiasuparents.com/post/1675157Sun, 01 May 2016 14:14:22 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 01 May 2016 08:28:18 GMT]]>

tankee:
Kindly help with the following qn, thanks.

Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?

I am able to find the solution, which is x= 9.5 and y=-14.

http://www.fa.edu.sg/wp-content/uploads/2016/05/img_20160501_162030-e1462090876491.jpg\">

If the question was to solve

y = 2x + 5
y = 2x - 33
or
y = -2x + 5
y = -2x - 33

then there is no solution

working:
sub. y = 2x+5 into the second equation,
2x+5=2x-33
5=-33 （Not a valid equation)
so no solution.

Please us know if you need further help, the tutors in our centre (who are IP/GEP/RGS/NYGH/ACJC teachers) are able to help you.

:rahrah:

]]>https://forum.kiasuparents.com/post/1675079https://forum.kiasuparents.com/post/1675079Sun, 01 May 2016 08:28:18 GMT<![CDATA[Reply to Lower Secondary Mathematics on Sun, 01 May 2016 08:05:29 GMT]]>Kindly help with the following qn, thanks.




Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution

]]>https://forum.kiasuparents.com/post/1675071https://forum.kiasuparents.com/post/1675071Sun, 01 May 2016 08:05:29 GMT<![CDATA[Reply to Lower Secondary Mathematics on Thu, 21 Apr 2016 13:56:09 GMT]]>

questionable_i:
Can anyone help me with this question.


1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.

Answer: ______________ or ______________

:thankyou:
sin (angle) = positive, when 0 < angle < 180
sin (angle) = negative, when 180 < angle < 360

Since sin (angle) = 0.7420 -> positive
Both angles must be between 0 to 180.
sin^(-1) 0.7420 = 47.9 deg (first ans)
180 deg - 47.9 deg = 132.1 deg (second ans)

]]>https://forum.kiasuparents.com/post/1671114https://forum.kiasuparents.com/post/1671114Thu, 21 Apr 2016 13:56:09 GMT<![CDATA[Reply to Lower Secondary Mathematics on Wed, 20 Apr 2016 08:39:40 GMT]]>Can anyone help me with this question.


1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.

Answer: ______________ or ______________

:thankyou:

]]>https://forum.kiasuparents.com/post/1670591https://forum.kiasuparents.com/post/1670591Wed, 20 Apr 2016 08:39:40 GMT