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Monday, December 11 2017 @ 08:38 PM CST
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 Pblm sum Q
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By: zinmkw (offline)  Thursday, July 19 2012 @ 11:23 PM CDT (Read 1444 times)  
zinmkw

Pls help me to solve this question by Pblm sum mthd

In a class room there are 130 students. 0.4 of the boys is equal to 0.25of the girls. How many more girl than boy students are there?


Thank u in adv.

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By: echeewh (offline)  Friday, July 20 2012 @ 04:59 AM CDT  
echeewh

hey zinmkw,

Following pls find my worked solution:

*** - buffer space for alignment purpose

B: 0.4 = (4/10)

G: 0.25 = (25/100) = (1/4)

***<-4u->
B: |--|--|--|--|--|--|--|--|--|--|

G: |-------|-------|-------|-------|
***<-1p->

This also means that 1 part (1p) of G has / contains the same number of students as 4 units (4u) of B.

Total G = 4p = 4 x 4u = 16u

Hence, total number of students
= B + G = 10u + 16u = 26u

26u --> 130
1u --> 130 รท 26 = 5

G - B = 16u - 10u = 6u
6u --> 6 x 5 = 30

There are 30 more girl students than boys.

==============================

Trust this helps.

Do let me know again should there be any clarification.

Cheers,
Edward

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By: zinmkw (offline)  Friday, July 20 2012 @ 05:58 AM CDT  
zinmkw

Thanks again for ur explanation
Smile

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