Q&A - PSLE Math

[Michaelia0816]

Thank! But I need help with a question:

John has 3 boxes of marbles. There are 2 more marbles in Box A than Box B. There are 18 marbles together in Box A and Box C. The total number of marbles in Box B and Box C is 9 more than the number of marbles in Box A. How many marbles does John have in all?

[tianzhu]

Michaelia0816:

Thank! But I need help with a question:

John has 3 boxes of marbles. There are 2 more marbles in Box A than Box B. There are 18 marbles together in Box A and Box C. The total number of marbles in Box B and Box C is 9 more than the number of marbles in Box A. How many marbles does John have in all?

Hi

You may use MD or use letters of the alphabet.

A ------- B + 2

A + C ------- 18

B + C ------- A + 9

B + C ------- (B + 2) + 9

C ------ 11
A ------- 7
B ------- 5

Total -------- 23

Best wishes

[Michaelia0816]

Thank you! Wow, you are fast in replying, I think you would took 20 min at least!

[tianzhu]

Michaelia0816:

Thank you! Wow, you are fast in replying, I think you would took 20 min at least!

Hi girl

You're welcome.

Best wishes

[Spongy]

Hi, I need help with 2 questions. Thanks.


1. Tina had $216 and Charlie had $184. Charlie spent 3 times as much as Tina and after that, Tina had 3 times as much money left as Charlie. How much did Charlie spend?

2. Mrs Tan went shopping with 46 more $5-notes than $2-notes. After using 70 of her $5-notes, she found that she had 4 times as many $2-notes as $5-notes. Find the total amount of money she had at first.

[tianzhu]

Spongy:

Hi, I need help with 2 questions. Thanks.

1. Tina had $216 and Charlie had $184. Charlie spent 3 times as much as Tina and after that, Tina had 3 times as much money left as Charlie. How much did Charlie spend?

Hi

You may use MD or represent the variables with “Units and Parts” or letters of the alphabet.

Spent
Tina ------ 1 unit
Charlie ------ 3 units

Left
Tina ------ 3 parts
Charlie ------ 1 part

3 parts + 1 unit ------ 216
1 part + 3 units ------ 184

4 parts + 4 units ------ 400
1 part + 1 unit ------ 100

2 units ------ 184 - 100
1 unit ------- 42

Charlie ------ 3*42 -------- 126

Best wishes

[tianzhu]

Spongy:

Hi, I need help with 2 questions. Thanks.

2. Mrs Tan went shopping with 46 more $5-notes than $2-notes. After using 70 of her $5-notes, she found that she had 4 times as many $2-notes as $5-notes. Find the total amount of money she had at first.

Hi

Hope this helps.

Best wishes

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[Spongy]

Thank you very much:-D

[tianzhu]

Spongy:

Thank you very much:-D

Hi

You're welcome.

Best wishes

[yomamas]

CRAZYBANANA:

jarenchuatw:

Thanks...but still can't really understand the 2nd part added on:


After 43x27=1161 rectangles have been For the width 166cm, there is a leftover of 166 - 27x6 = 4cm
Of which, 173/6 = 28 (round down) more rectangles can be cut.
Total = 1161 + 28 = 1189

Tot that we have already cut out some rectangles from 173, how come can still divide by 6 again??

Ya! Since the 173cm side has been cut into 43pc x4cm, then balance is only 1cm, cannot use liao! :?

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