Q&A - PSLE Math

[kiasuursula]

I need help with this question:


Candle A and Candle B are of the same length. Candle A, which is broader, can burn for 5h while Candle B, the thinner candle, can burn for 4h. If both candles are lighted at the same time, how long does it take for Candle A to be twice as long left as Candle B?
:thankyou:

[2DMommy]

Please help me with these two questions :


1) Jay bought some chocolates and gave half of it to Kay. Kay bought some sweets and gave half of it to Jay. Jay ate 12 sweets and Kay ate 18 chocolates and then the ratio of Jay’s sweets to chocolates became 1:7 and the ratio of Kay’s sweets to chocolates became 1:4. How many sweets did Jay have at first ?

2)There are more pupils in School A then School B. 30% of the pupils in School A is 45 more than 40% of the pupils in School B. If 10% of the pupils in School A leaves to join School B, there will be 200 more pupils in School A than School B. How many pupils are there in School B?

Thank you !

[tianzhu]

shell:

Dear Aunties/Uncles,

I'm using my mum's a/c. I need help with this Q. :gloomy: Amy ,Ben and Cathy were the top 3 scorers in a spelling competition. their teacher gave them a bag of marbles to share.Amy, the top scorer, received 2/3 bag of the marbles and 1/3of a marble, Ben, with the second highest score, received 2/3 of the remaining marbles and 1/3 of a marble. if there was only 1 marble left in the bag for Cathy, how many marbles were in the bag at first?

i would really appreciate it if any one of you could help me. i thank you in advance! :thankyou:

Hi

I think it should be read as \" 2/3 of the remaining bag of marbles'.

Your question is similar to this question which has been discussed earlier.

The solution to your question.

1 unit ----- 4/3

3 units ------ 4

1 part ------ 13/3

3 parts ------ 13

Hope this helps.

Best wishes

http://farm5.staticflickr.com/4019/4713599224_8f586290c0_z.jpg\">

[tianzhu]

kiasuursula:

I need help with this question:


Candle A and Candle B are of the same length. Candle A, which is broader, can burn for 5h while Candle B, the thinner candle, can burn for 4h. If both candles are lighted at the same time, how long does it take for Candle A to be twice as long left as Candle B?
:thankyou:

Hi

Please go to page 551.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=740265

Best wishes

[tianzhu]

2DMommy:

2)There are more pupils in School A then School B. 30% of the pupils in School A is 45 more than 40% of the pupils in School B. If 10% of the pupils in School A leaves to join School B, there will be 200 more pupils in School A than School B. How many pupils are there in School B?

Hi

Please go to page 779.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php&f=69&t=280&p=836419

Best wishes

[shell]

tianzhu:

shell:

Dear Aunties/Uncles,

I'm using my mum's a/c. I need help with this Q. :gloomy: Amy ,Ben and Cathy were the top 3 scorers in a spelling competition. their teacher gave them a bag of marbles to share.Amy, the top scorer, received 2/3 bag of the marbles and 1/3of a marble, Ben, with the second highest score, received 2/3 of the remaining marbles and 1/3 of a marble. if there was only 1 marble left in the bag for Cathy, how many marbles were in the bag at first?

i would really appreciate it if any one of you could help me. i thank you in advance! :thankyou:

Hi

I think it should be read as \" 2/3 of the remaining bag of marbles'.

Your question is similar to this question which has been discussed earlier.

The solution to your question.

1 unit ----- 4/3

3 units ------ 4

1 part ------ 13/3

3 parts ------ 13

Hope this helps.

Best wishes

http://farm5.staticflickr.com/4019/4713599224_8f586290c0_z.jpg\">

Thank you. Daughter has been so anxious for the reply

[kiasuursula]

tianzhu:

kiasuursula:

I need help with this question:


Candle A and Candle B are of the same length. Candle A, which is broader, can burn for 5h while Candle B, the thinner candle, can burn for 4h. If both candles are lighted at the same time, how long does it take for Candle A to be twice as long left as Candle B?
:thankyou:

Hi

Please go to page 551.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=740265

Best wishes

:thankyou:

[tianzhu]

2DMommy:

Please help me with these two questions :

1) Jay bought some chocolates and gave half of it to Kay. Kay bought some sweets and gave half of it to Jay. Jay ate 12 sweets and Kay ate 18 chocolates and then the ratio of Jay's sweets to chocolates became 1:7 and the ratio of Kay's sweets to chocolates became 1:4. How many sweets did Jay have at first ?

Hi

Here's the solution to a similar question.

Hope this helps.

Best wishes

http://farm6.staticflickr.com/5045/5642609859_22462520cc_z.jpg\">

[Robertpattinsonidle]

this question seriously mind boggling.



Both shops ABC and XYZ , offered a 15% discount for the same type of mattress. If Mr Muthu were to buy from shop XYZ ,he would have paid $38.25 less than the discounted price in shop ABC. a) What was the discounted price in the shop ABC ?
b) the original price of the mattress in Shop ABC was $1510. what was the minimum percentage discount it must offer so that the discounted price in shop ABC would be lower than the discounted price in Shop XYZ? Give your answer correct to the nearest percent.

[paranoid]

The figure below is made up of Squares EFGH and PQRS, a circle and two identical semicircles. J and K are the midpoints of PQ and RQ respectively.

P, Q, R, and S are the midpoints of EF, FG, GH and EH respectively.

Use the calculator value of pi to find the total area of the shaded parts, correct to 2 decimal places.

http://i48.tinypic.com/339k95z.png\">

Thanks in advance.