## Q&A - PSLE Math

### Re: Q&A - PSLE Math

Please help with this question and advanced thanks.

Alan had 6/7 as many stickers as Benny.

Alan gave away 40% of his stickers while Benny bought 78 more stickers. In the end, the ratio of the number of stickers Alan had to the number of stickers Benny had become 3:8.

How many stickers did Alan have at first?

Alan had 6/7 as many stickers as Benny.

Alan gave away 40% of his stickers while Benny bought 78 more stickers. In the end, the ratio of the number of stickers Alan had to the number of stickers Benny had become 3:8.

How many stickers did Alan have at first?

### Re: Q&A - PSLE Math

Help appreciated very much:

Jack and Bill cycle the same distance to school everyday. They always leave their homes at the same time. Jack's average speed is 7 km/h while Bill's average speed is 5.6 km/h.

One day, after cycling for 12 minutes, Jack realised that he had forgotten to bring his English homework. He cycled back home immediately to get his homework while Bill continued his journey to school.

Without changing any of their cycling speeds, Jack managed to reach the school at the same time as Bill.

Find the distance between their homes and school.

Jack and Bill cycle the same distance to school everyday. They always leave their homes at the same time. Jack's average speed is 7 km/h while Bill's average speed is 5.6 km/h.

One day, after cycling for 12 minutes, Jack realised that he had forgotten to bring his English homework. He cycled back home immediately to get his homework while Bill continued his journey to school.

Without changing any of their cycling speeds, Jack managed to reach the school at the same time as Bill.

Find the distance between their homes and school.

- MathIzzzFun
- KiasuGrandMaster
**Posts:**2358**Joined:**Wed Mar 09,**Total Likes:**5

### Re: Q&A - PSLE Math

voltes5 wrote:Please help with this question and advanced thanks.

Alan had 6/7 as many stickers as Benny.

Alan gave away 40% of his stickers while Benny bought 78 more stickers. In the end, the ratio of the number of stickers Alan had to the number of stickers Benny had become 3:8.

How many stickers did Alan have at first?

cheers.

- MathIzzzFun
- KiasuGrandMaster
**Posts:**2358**Joined:**Wed Mar 09,**Total Likes:**5

### Re: Q&A - PSLE Math

Jack would take another 12 min to cycle home. This means that Bill would have been cycling for 24 min. We can consider the question as Jack starting out from home 24 min after Bill has started.voltes5 wrote:Help appreciated very much:

Jack and Bill cycle the same distance to school everyday. They always leave their homes at the same time. Jack's average speed is 7 km/h while Bill's average speed is 5.6 km/h.

One day, after cycling for 12 minutes, Jack realised that he had forgotten to bring his English homework. He cycled back home immediately to get his homework while Bill continued his journey to school.

Without changing any of their cycling speeds, Jack managed to reach the school at the same time as Bill.

Find the distance between their homes and school.

Ratio of Jack's speed : Bill's speed = 7 : 5.6 = 5 : 4

Ratio of Jack's time : Bill's time to cycle from home to school = 4u : 5u

Since Bill started 24 min earlier,

5u - 4u = u → 24 min

So, distance from home to school = 7 km/h x 4 x 24/60 h = 11.2 km

cheers.

### Re: Q&A - PSLE Math

Hi, need help to solve this question. Thank you in advance.

Keith and Shawn each have some money. If Keith spends $38, the ratio of the amount of money Keith has to the amount of money Shawn has will be 2 : 5.

If Shawn spends $38, the ratio will be 8 : 11.

How much money does each boy have?

Keith and Shawn each have some money. If Keith spends $38, the ratio of the amount of money Keith has to the amount of money Shawn has will be 2 : 5.

If Shawn spends $38, the ratio will be 8 : 11.

How much money does each boy have?

- speedmaths.com
- BrownBelt
**Posts:**559**Joined:**Mon Oct 12,**Total Likes:**3

### Re: Q&A - PSLE Math

Hi,tracywham wrote:Hi, need help to solve this question. Thank you in advance.

Keith and Shawn each have some money. If Keith spends $38, the ratio of the amount of money Keith has to the amount of money Shawn has will be 2 : 5.

If Shawn spends $38, the ratio will be8 : 11.

How much money does each boy have?

Please check the numbers again.

Should the second ratio be

**8 : 13**instead?

**If so**, then the answer should be:

**Keith has $152 and Shawn has $285**

Please let us know if you still need help.

Cheers

**Speed Maths**

.

### Re: Q&A - PSLE Math

Thanks very much Beauty Minds for the clear explanation.Beautyful Minds wrote:Hi Laurel111,

Please refer to the link below for the detailed solution.

http://geniebookapp.com/public_question ... Qt6iR12zBT

Let us know if you have any doubts.

Beautyful Minds

- Whitearies
- GreenBelt
**Posts:**115**Joined:**Thu Aug 01,

### Re: Q&A - PSLE Math

There were some pies and cakes for sale in a pastry shop. 1/4 of the pastries were pies. The pastry chef then baked an equal number of pies.

A) will the percentage of cakes increase, decrease or remain the same?

B) what percentage of the pastries will be cakes?

A) will the percentage of cakes increase, decrease or remain the same?

B) what percentage of the pastries will be cakes?

Last edited by Whitearies on Tue Apr 07, 2015 11:20 pm, edited 3 times in total.