Tutor MathsGuru: Ask me for your burning Maths questions!

[tianzhu]

Hi

Hope this helps.
http://farm5.static.flickr.com/4129/4842986868_3803e18102_b.jpg\">

Best wishes

[mathsguru]

Carrot:

Hi Maths Guru please help :?: DS cannot solve and I also cant do


My friend and I went to a bookstore to buy books. We bought a total of 18 books over the last 3 days. The number of books I bought on the third day is equal to the sum of the total number of books my friend bought on the 2nd day and third days. The number of books my friend bought on the first day is 2 more than the sum of what I bought on the first and second days. How many books did each one of us buy?

Hi Carrot,

Here's my solution using models. Hope it can give your DS a better visualisation.


MathsGuru

http://www.postimage.org/image.php?v=gxbk9J0

[mathsguru]

markfch:

The qn is:


The total age of Danny and Mike is 37 yrs old. Danny is 9 yrs older than Mike. What was Mike's age 5 yrs ago?

Of course mentally I know the ans. If I say 2y + 9 = 37, I'm afraid it's hard for ds to follow.

How do I present the working in a simplier way so that ds can follow? (as long as I can present it systematically, I'm sure he will understand). Thanks.

Hi Markfch,

You can guide your DS slowly to draw the model out for this diagram. My advice to my students is to let the person with smallest no. of items, weight, money, etc (in this case, age) be 1 unit. In algebraic terms, this will be \"x\".

Here's my solution for your reference.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=TsGg5IS

[mathsguru]

biscuitqueen:

Hi there, please help me solve this Maths questn for my daughter.

I have no idea how to solve. Thanx!

Mary and Ken travelled from Town A to Town B. Mary left Town A at 0915 and took 4h to reach Town B. Ken left Town A at 1000 and took 2h 45min to reach Town B. At what time did Ken pass Mary?

Hi Biscuitqueen,

Here's my solution. Hope it helps!

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gxbp40J

[mathsguru]

optimistforum:

optimistforum:

Hi Maths Guru


Can you look at this Clock Question, please?

Please help on the answer to the question below.

John and Tom race around a circular track, divided like the face of a clock, into 12 sections. If John gives Tom four sections start and runs half as fast again as Tom, at what point on the track will he overtake Tom? (Assume on the clock face that John and Tom start at 12 and 4, respectively).

The answer is 12, however, if John gives Tom four sections starts and is half as fast, surely does not half as fast mean that John is running at half the speed of Tom. And if he is 4 sections behind, surely Tom will win. Unless half as fast means that John runs at 1.5 times of Tom. Tearing my hair out here. Please help!!!

Hi, do all questions get answered, as I have checked on here, and my PM to see if the above question has been answered - and it has not :?

Hi Optimistforum,

Like what you had mentioned, there's an error in the question because there's no way John could have overtaken Tom if he gave Tom a headstart and still run slower than Tom.

Perhaps you would like to re-check the source of the question?

Cheers,
MathsGuru

[mathsguru]

Cheerfuldad:

Dear all,


Please help!

P5 Question:

Q. Four girls, Alice, Bibi, Carol and Delia, each have some stickers. the number of stickers Alice has is 1/2 of the total number of the stickers Bibi, Carol and Delia have. The number of stickers Bibi has is 1/4 of the number of stickers Alice, Carol and Delia have. The number of stickers Carol has is 2/3 of the total number of stickers Alice, Bibi and Delia have. If Delia has 30 stickers, Find the total number of stickers Bibi and Carol have altogether. :?:

TIA

Hi Cheerfuldad,

Here's my solution.

Hope it helps!

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=TsGmojA

[Skydust]

Hello Mathguru,


How do you solve this question?

A box of donuts is shared equally among Clara,Siti and Joy. Clara divided her share into 3 equal packets. Siti divided her share into 4 equal boxes.Joy divided her share into 6 equal boxes. The total number of donuts in 2 of Clara’s boxes, 3 of Siti’s boxes and 3 of Joy’s boxes is 138. What is the total number of donuts in the box at first?

EDIT: I got the answer 216, is it correct?

[mathsguru]

Skydust:

Hello Mathguru,


How do you solve this question?

A box of donuts is shared equally among Clara,Siti and Joy. Clara divided her share into 3 equal packets. Siti divided her share into 4 equal boxes.Joy divided her share into 6 equal boxes. The total number of donuts in 2 of Clara's boxes, 3 of Siti's boxes and 3 of Joy's boxes is 138. What is the total number of donuts in the box at first?

EDIT: I got the answer 216, is it correct?

Hi Skydust,

Yes, your answer is correct! I've done up a model diagram for your reference. The trick here is to use LCM to obtain a common no. of units for each of them.


MathsGuru

http://www.postimage.org/image.php?v=PqikHv9

[Tang]

mathsguru:

biscuitqueen:

Hi there, please help me solve this Maths questn for my daughter.

I have no idea how to solve. Thanx!

Mary and Ken travelled from Town A to Town B. Mary left Town A at 0915 and took 4h to reach Town B. Ken left Town A at 1000 and took 2h 45min to reach Town B. At what time did Ken pass Mary?

Hi Biscuitqueen,

Here's my solution. Hope it helps!

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gxbp40J

Hello,

I believe this is the 3rd time I am highlighting the same issue in this forum. For the benefit of those taking PSLE 2010, I will repeat it for the very last time. Please note that the below statement will be marked wrong.

10 am + 1 h 39 min = 11.39 am

You will easily lose 1 mark for mixing Time with Duration.

[clblinym]

tianzhu:

Hi

Hope this helps.
http://farm5.static.flickr.com/4129/4842986868_3803e18102_b.jpg\">

Best wishes

~~~~~~~~~~~~~~~~~~
Dear tianzhu,

Thank you so much for the detailed explanation. I really appreciate your help. It is very nice to have you guys here.

Thanks and regards,
Amy