Pls help for maths holiday homework

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Pls help for maths holiday homework

Postby annloww » Thu Jun 05, 2014 3:53 pm

Hi Parents

I had a hard time for the followings very tough pls help us thanks:

q1) At the school funfair, every boy is given 5 chops while each girl is given 6 chops. given that 60% of the children who attended were boys and the boys received 2160 more chops than the girls, how many girls were at the school funfair?

2) At the school fun fair, every boy is given 4 chops while each girl is given 6 chops. there were 216 more boys than girls who attended the funfair.
Given that the boys and the girls received an equal number of chops, how many girls were at the school funfair?

3) A bag contained some 10cents, 20 cent and 50 cents. 2/5 of the 10 cents is equal to 3/4 of the 20 cents. there are 20% as many 20 cents as 50 cents coins. Given that the total amount of these coins in the bag is $92.40, how many coins are there altogether?

Thank you very much

annloww
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Re: Pls help for maths holiday homework

Postby A better tomorrow » Thu Jun 05, 2014 4:11 pm

1) boys -> 60%
Girls -> 100%-60%=40%
Difference -> 60%-40%=20%
1260x2= 2520
20%=2520
40% = 5040
2) (same method as 1)

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Re: Pls help for maths holiday homework

Postby annloww » Thu Jun 05, 2014 5:27 pm

sorry where to get 1260 and why need to x 2 very sorry i cannot understand.

Thanks for your help

annloww
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Re: Pls help for maths holiday homework

Postby annloww » Thu Jun 05, 2014 5:28 pm

there is also information about each girl n boy get is this information not using at all? thanks you

annloww
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Re: Pls help for maths holiday homework

Postby AdaptiveLearning.sg » Thu Jun 05, 2014 7:02 pm

1) Algebra?
Given that 60% of the children who attended were boys,

(No of Boys)/(No of Girls)=6/4
(No of Boys)=(No of Girls)x6/4 ... (1)

...every boy is given 5 chops while each girl is given 6 chops...boys received 2160 more chops than the girls,

(No of Boys)x(Chops that Boys Get)-(No of Girls)x(Chops that Girls Get)=2160
(No of Boys)x5-(No of Girls)x6=2160 ... (2)

Sub (1) to (2):
(No of Girls) x 6/4 x5 - (No of Girls)*6= 2160
(No of Girls) x 5/4 - (No of Girls) = 360
(No of Girls) x 1/4 = 360
No of Girls = 1440

AdaptiveLearning.sg
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Re: Pls help for maths holiday homework

Postby annloww » Thu Jun 05, 2014 8:00 pm

Thank you very very much 谢谢

annloww
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