Q&A  P5 Math (Page 173)
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Q&A  P5 Math
Re: Q&A  P5 Math
MathIzzzFun wrote:Trina wrote:Please assist with this question:
There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?
Thanks!
Assume all boys donated, total amount > 40 x $3 = $120
$120  $30 = $90  excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 4018 = 22
cheers.
Thanks but still dont get it.. Can provide narration? Thanks
 Trina
 GreenBelt
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Re: Q&A  P5 Math
Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?
(not sure if this has been asked before, pls refer me to correct page. Thanks!)
(not sure if this has been asked before, pls refer me to correct page. Thanks!)
 ttyh
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Re: Q&A  P5 Math
ttyh wrote:Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?
(not sure if this has been asked before, pls refer me to correct page. Thanks!)
3 units > $140  $92 = $48
1 unit > $48 / 3 = $16
$92  $16 = $76
Each of them spent $76
 php
 KiasuGrandMaster
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Re: P5 Onsponge Conquer Problem Sums Answer key
If you need the whole answer key, I don't think I could help. But if you just need some answers from the answer key, then you can go to the website. http://www.onsponge.com/shop/onlinesolutions.html
Hope I helped
Hope I helped

Trevortan  GreenBelt
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Re: Q&A  P5 Math
Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene's share was equal to 5 times of Fabian's share. 4 times of Serene's share was also equal to 3 times of Eileen's share. Calculate Serene's share.
Help ...... please. How should the answers be presented and is this really a P5 appropriate question?
Thank you very much.
Help ...... please. How should the answers be presented and is this really a P5 appropriate question?
Thank you very much.
 Oracle
 OrangeBelt
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Re: Q&A  P5 Math
Oracle wrote:Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene's share was equal to 5 times of Fabian's share. 4 times of Serene's share was also equal to 3 times of Eileen's share. Calculate Serene's share.
Help ...... please. How should the answers be presented and is this really a P5 appropriate question?
Thank you very much.
Hi Oracle,
One Possible Solution:
Twice of Serene's share was equal to 5 times of Fabian's share.
This means that ratio of Serene's share to Fabian's share is 5:2
(Just interchange the 2 numbers)
4 times of Serene's share was also equal to 3 times of Eileen's share.
This means that ratio of Serene's share to Eileen's share is 3:4
(Just interchange the 2 numbers)
Ratio of Serene's share to Fabian's share is 5:2
Ratio of Serene's share to Eileen's share is 3:4
Ratio of Serene's share to Fabian's share to Eileen's share is 15:6:20
15 + 6 + 20 = 41 units
41 units = $4100
Can you work from here?
Cheers
speedmaths.com
.
 speedmaths.com
 KiasuGrandMaster
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Re: Q&A  P5 Math
Oracle wrote:Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene's share was equal to 5 times of Fabian's share. 4 times of Serene's share was also equal to 3 times of Eileen's share. Calculate Serene's share.
Help ...... please. How should the answers be presented and is this really a P5 appropriate question?
Thank you very much.
cheers.
 MathIzzzFun
 KiasuGrandMaster
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Re: Q&A  P5 Math
Trina wrote:MathIzzzFun wrote:Trina wrote:Please assist with this question:
There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?
Thanks!
Assume all boys donated, total amount > 40 x $3 = $120
$120  $30 = $90  excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 4018 = 22
cheers.
Thanks but still dont get it.. Can provide narration? Thanks
cheers.
 MathIzzzFun
 KiasuGrandMaster
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Re: Q&A  P5 Math
this seems quite ingenious, but rather mind bending. Think I'll stick to simultaneous equations.
 TheBluePapa
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Re: Q&A  P5 Math
Yes Speedmath, I got it. Just have to put Serene on the same platform & everything becomes clear.
However this is a "whole number" question. Son hasn't been taught ratio yet so perhaps got to use MathIzzzFun's workings but I wonder how the common numerator 60 come about.
Could MathIzzzFun enlighten me please.
Thank you very much.
However this is a "whole number" question. Son hasn't been taught ratio yet so perhaps got to use MathIzzzFun's workings but I wonder how the common numerator 60 come about.
Could MathIzzzFun enlighten me please.
Thank you very much.
 Oracle
 OrangeBelt
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