Q&A - PSLE Math

[Michaelia0816]

I think this is not in the syballus but my teacher just gave us the Hw to be completed within 2 days, it hard, first time approaching such question, -.-

[Michaelia0816]

Thx you very much, whoa, finally finished!

[Michaelia0816]

Tianzhu, sorry, I just realized that I had missed out 1 question, pls help. Same like others, I dun know how to do it, I bit confused in this question so pls help,


9. A and B had 864 stamps altogether.A gave B some stamps and B’ stamps increased by 50%. In return, B gave A some of her stamps and A’s stamps increased by 20%. In the end, each of them had an equal number of stamps. What was the percentage increase or decrease in the number of B’s stamps?

[peggy]

please assist.


\tMr and Mrs Leong left their house at the same time but travel in opposite directions. Mr Leong travelled towards bedok while Mrs Leong headed for Kallang. Mrs Leong drove at a speed which was 10km/h slower than Mr Leong. 30 minutes later, when Mr Leong reached Bedok, they were 95 km apart. How far did Mrs Leong travel when Mr Leong reached Bedok ?

thanks.

[Michaelia0816]

Michaelia0816:

Tianzhu, sorry, I just realized that I had missed out 1 question, pls help. Same like others, I dun know how to do it, I bit confused in this question so pls help,


9. A and B had 864 stamps altogether.A gave B some stamps and B' stamps increased by 50%. In return, B gave A some of her stamps and A's stamps increased by 20%. In the end, each of them had an equal number of stamps. What was the percentage increase or decrease in the number of B's stamps?

I need it by Sat, so pls help. As soon as possible.

[tianzhu]

peggy:

please assist.


\tMr and Mrs Leong left their house at the same time but travel in opposite directions. Mr Leong travelled towards bedok while Mrs Leong headed for Kallang. Mrs Leong drove at a speed which was 10km/h slower than Mr Leong. 30 minutes later, when Mr Leong reached Bedok, they were 95 km apart. How far did Mrs Leong travel when Mr Leong reached Bedok ?

thanks.

Hi

As in any Speed question, start with a simple diagram.

In 1h, Mrs Leong covered 10 km less than Mr Leong.

In 30 minutes, Mrs Leong covered 5km less than Mr Leong.

1unit (Mrs Leong) + 1 unit + 5 (Mr Leong) ------ 95

1 unit ------- 45

Mrs Leong travelled 45 km

Best wishes

[tianzhu]

Michaelia0816:

Michaelia0816:

Tianzhu, sorry, I just realized that I had missed out 1 question, pls help. Same like others, I dun know how to do it, I bit confused in this question so pls help,


9. A and B had 864 stamps altogether.A gave B some stamps and B' stamps increased by 50%. In return, B gave A some of her stamps and A's stamps increased by 20%. In the end, each of them had an equal number of stamps. What was the percentage increase or decrease in the number of B's stamps?

I need it by Sat, so pls help. As soon as possible.

Hi

You may use \"Work Backwards\" for your question.

There are some examples in earlier posts.I'll try to find my earlier solutions to similar questions later.

Best wishes

[peggy]

Tianzhu,


Thanks for your prompt reply.


Cheers !

[tianzhu]

Hi Michaelia0816


Ah girl, here's a similar type of question.

Hope this helps.

Best wishes

http://farm6.staticflickr.com/5213/5473328668_0005b89f67_z.jpg\">

[tianzhu]

peggy:

Tianzhu,


Thanks for your prompt reply.


Cheers !

Hi

You're welcome.

Best wishes