Tutor MathsGuru: Ask me for your burning Maths questions!

[MathIzzzFun]

lee tong fong:

Mathizzfun, can you help me for question 5 as there is no response yet. As for question 3, can you help me confirm the correct answer is $5.40 or $1.50 or $17.50.Your solution should be correct, I believe. I do not have the answer as the questions are from school and to be hand out on Monday.

Thanks

(5) Peanut butter sandwiches and egg sandwiches are put on 2 plates, X and Y, such that there are equal number of sandwiches on each plate.
The ratio of the number of peanut butter sanswiches on plates x to the number of the peanut butter sanswiches on plates Y is 5:4.
The ratio of the number of egg sanswiches on plates x to the number of the egg sanswiches on plates Y is 3:5.
Find the ratio of the number of peanut butter sandwices on plates Y to the number of egg sandwiches on plate X.

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(3) To make a fruit cake, Mrs Lim used 90% strawberry and 10% mango.
The cost of the mangoes was 1.5 times that of the strawberries.
She spent $6.30 in all for the strawberries and mangoes
How much more would it cost her if she uses 40% strawbeey and 60% mango?

Here's another approach for this question:

Fruit cake --> 10 units --> 9 units of strawberries + 1 unit of mangoes

cost of 1 unit of mangoes
= 1.5 x cost of 9 units of strawberries
= cost of 13.5 units of strawberries

total cost of fruit cake with 90% strawberries & 10% mangoes
--> cost of 9 units of strawberries + cost of 13.5 units of strawberries
= cost of 22.5 units of strawberries --> $6.30
cost of 1 unit of strawberries --> $0.28

To make the fruit cake with 4 units of strawberries and 6 units of mangoes,
total cost
= 4 x $0.28 + 6 x 13.5 x $0.28
= $ 23.80

additional cost --> $23.80 - $6.30 = $17.50

cheers.

[lee tong fong]

Thanks Mathizzfun for your great help.

[AbiSuresh]

Hi Maths guru,

There were some sweets in Boxes A, B and C. Box A contained 1/7 of the total number of sweets in Boxes B and C.
The ratio of the number of sweets in Box B to the total number of sweets in Boxes A and C is 3:1.
If there are 30 more sweets in Box B than Box A, find the total number of sweets in Boxes A, B and C.

[MathIzzzFun]

AbiSuresh:

Hi Maths guru,

There were some sweets in Boxes A, B and C. Box A contained 1/7 of the total number of sweets in Boxes B and C.
The ratio of the number of sweets in Box B to the total number of sweets in Boxes A and C is 3:1.
If there are 30 more sweets in Box B than Box A, find the total number of sweets in Boxes A, B and C.

Box A --> 1/8 of total number of sweets -- (A --> 1 part, B&C --> 7 parts, total --> 8 parts)

Box B --> 3/4 of total number of sweets -- (B --> 3 units, A&C --> 1 unit, total --> 4 units)

1 - 1/8 - 3/4 = 1/8

Box C --> 1/8 of total number of sweets

There are 30 more sweets in B than in A,

3/4 - /18 = 5/8

5/8 of total number of sweets --> 30
Total number of sweets --> 8/5 x 30 = 48 sweets.

cheers.

[elishatan]

#1

http://elishatan.com/wp-content/uploads/2013/05/Evernote-Camera-Roll-20130506-142936-e1367824091265.jpg\">

#2
http://elishatan.com/wp-content/uploads/2013/05/Evernote-Camera-Roll-20130506-142928-e1367824147306.jpg\">

#3
http://elishatan.com/wp-content/uploads/2013/05/Evernote-Camera-Roll-20130506-142852-e1367824206891.jpg\">

#4
http://elishatan.com/wp-content/uploads/2013/05/Everno1te-Camera-Roll-20130506-142844-e1367824273638.jpg\">

[AbiSuresh]

Thank you very much

MathIzzzFun:

AbiSuresh:

Hi Maths guru,
There were some sweets in Boxes A, B and C. Box A contained 1/7 of the total number of sweets in Boxes B and C.
The ratio of the number of sweets in Box B to the total number of sweets in Boxes A and C is 3:1.
If there are 30 more sweets in Box B than Box A, find the total number of sweets in Boxes A, B and C.

Box A --> 1/8 of total number of sweets -- (A --> 1 part, B&C --> 7 parts, total --> 8 parts)

Box B --> 3/4 of total number of sweets -- (B --> 3 units, A&C --> 1 unit, total --> 4 units)

1 - 1/8 - 3/4 = 1/8

Box C --> 1/8 of total number of sweets

There are 30 more sweets in B than in A,

3/4 - /18 = 5/8

5/8 of total number of sweets --> 30
Total number of sweets --> 8/5 x 30 = 48 sweets.

cheers.

[hands on blessed mum]

Hi, need your help to solve this question;

[NYPSkiasuparent]

atutor2001:

suiyuan:

Hi
Thank you for your offer.

1)During a warehouse book sale, Sally spent 62.5% of her money on 24 books and 18 pens. She also spent 25% of her remaining money on 18 files. Each pen costs 8/9 as much as the price of one book. The file costs $7.80 less than a book. Find the total cost of one book and one pen.

2)Mr Lim spent $1496 on some comics and dictionaries altogether. The number of comics bought to the number of dictionaries bought was in the ratio of 3 : 2. A dictionary cost $4 more than a comic. The total cost of the comics was 20% more than the total cost of the dictionaries. Find the cost of a dictionary.

Hi suiyuan

You are very \"naughty\". But the 2nd question is a bit easssy!

Regards

Why is she naughty?

[jkids]

hi maths guru

I need some advice, not on problem sums but rather can you recommend an enrichment centre for my child? he is weak in maths, others subjects lik eng and Chinese is ok. recently he failed his maths, got 27/70

he seem to have prob understanding the math q, esp prob sums. what goes wrong, I really duno. we need to explain a few times, but sometime he still dun get it. he only has eng tuition but we intend to withdraw him fr eng class and enrol him for math class. can you recommend? I saw a few...cma , mind matter, mind stretcher...but dun really noe which is a better one...

thanks..

[milo-cupcake]

Hi Maths guru,

This is my DD recently SA1 Maths question. My DD and her classmates answer was 180 but the answer given by the teacher was 120. Please can you tell whose answer is correct?
Thanks in advance!

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