Answers

2016-03-23T16:23:50+05:30
Fraction of boys = 5/8

Fraction of girls = 1 - 5/8 = 3/8

Let the total number of students be x

So, girls = 3/8 × x
240 = 3/8 × x
x = 240×8/3 = 640

Number of boys = 5/8 of 640
= 5/8 × 640
= 400
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2016-03-23T16:27:34+05:30
Let the total number of students in school be 'x'
Now, boys will be = 5/8*x = 5x/8
therefore, 240+5x/8 = x
on transposing 5x/8 to RHS
                 240 = x - 5x/8
             8*240 = 8x-5x
               640 = x
HENCE, number of boys in school are 5x/8 = 5*640/8 = 400
HOPE ......... you will understand it
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