Q&A - PSLE Math

[tianzhu]

Beikiasu:

tianzhu , :thankyou:


1) Willian & Kate
How you know 20% more is 6u & 5u?

Hi

Just curious, is this question asked by the PSLE kid or the mummy?

Best wishes

[tianzhu]

Beikiasu:

3) Female & Male
Your eye so sharp, straight away you can see 10u. I tried drawing model but couldn't find the answer.

Hi

Using MD and 10u as the base,you still can arrive at the answer.In answering any question, we always strive towards simplicity.Try to use whole numbers instead of decimals if possible.

You may present your anwers in MD or units format.

Best wishes

[Musicstar]

Please help me to solve these questions. Thank you.


1) Tank A , B and C contained some water. 1/3 of the water in Tank A was transferred to Tank B. 1/4 of the water in Tank B was then transferred to Tank C . Lastly, 1/5 of the water in Tank C was transferred to Tank A. In the end, there were 600 ml of water in each tank. What was the volume of water in Tank A at first?

[Beikiasu]

tianzhu:

Beikiasu:

tianzhu , :thankyou:


1) Willian & Kate
How you know 20% more is 6u & 5u?

Hi

Just curious, is this question asked by the PSLE kid or the mummy?

Best wishes

asked by mummy.

[tianzhu]

Beikiasu:

asked by mummy.

Hi

120%:100%

120:100

6:5

Best wishes

[speedmaths.012624com]

Musicstar:

Please help me to solve these questions. Thank you.


1) Tank A , B and C contained some water. 1/3 of the water in Tank A was transferred to Tank B. 1/4 of the water in Tank B was then transferred to Tank C . Lastly, 1/5 of the water in Tank C was transferred to Tank A. In the end, there were 600 ml of water in each tank. What was the volume of water in Tank A at first?

Hi,

http://i47.tinypic.com/25jgr5s.jpg\">

One possible method: Work Backwards.

Can you make sense of the numbers?

Cheers



speedmaths.com


.

[Beikiasu]

tianzhu :thankyou:

[Beikiasu]

Hi, can someone help me to solve this problem sum?


1) Kumar had 50% more bookmarks than Leon. Max had 75% as many bookmarks as Kumar. Kumar and Leon gave Max a number of bookmarks in the ratio 3:1. As a result Max had twice as many bookmarks as before, and Leon had 16 bookmarks more than Kumar. How many bookmarks did Kumar give to Max? Ai Tong, 2011, Question 17, 5 mark, Ans:216.

2) There are two bags of jelly beans labelled A and B. In bag A, there are 470 red jelly beans and 480 green jelly beans. In bag B, there are 350 red jelly beans and 200 green jelly beans. Some red and green jelly beans from bag B are transferred to bag A. As a result, 60% of the jelly beans in Bag A and 20% of those in Bag B are red. How many red and how many green jelly beans are transferred from Bag B to Bag A?HP, 2011, Question 14, 4 mark, Ans: Red: 310, Green:40.

3) A contractor needed to cover an entire hall with tiles. On the first day, he laid 319 tiles. He completed tiling the rest of the hall in 7 days using an equal number of tiles each day. At the end of the 4th day, he was able to tile 8/15 of the hall. How many tiles did the contractor use to cover the entire hall? CHIJ, 2011, Question 15, 4 mark, Ans:1740 tiles.

Thanks

[Musicstar]

:thankyou:

speedmaths.com:

Musicstar:

Please help me to solve these questions. Thank you.

1) Tank A , B and C contained some water. 1/3 of the water in Tank A was transferred to Tank B. 1/4 of the water in Tank B was then transferred to Tank C . Lastly, 1/5 of the water in Tank C was transferred to Tank A. In the end, there were 600 ml of water in each tank. What was the volume of water in Tank A at first?

Hi,

http://i47.tinypic.com/25jgr5s.jpg\">

One possible method: Work Backwards.

Can you make sense of the numbers?

Cheers



speedmaths.com


.

[Musicstar]

http://i49.tinypic.com/1zouj5x.jpg\">


Hi,

I saw the working method but not really understand it. For this type of pattern question, is it must memorise the step of working. How to handle this type of question.

For question (a) is easy can do listing but for (b) if the number is very big not possible to do listing. What is the formula to do such question? Thank you.