Question

in a class,the number of girls is 15 less than number of boys. if the toatal number of students in the class is 57,find the number of girls.​

Answer 1

Answer:

Let the no. of boys be x

No. of girls = x - 15

Total no. of students = x + x - 15 = 57

2x - 15 = 57

2x = 72

x = 36 = no. of boys

No. of girls = x - 15 = 36-15 = 21

Hope it helps..!!

Answer 2

Answer:

Let no of boys =x

then no of girls =x-15

Now

total students =57

=>x+x-15=57

2x-15=57

2x=72

x=36

hence no of girls is 36-15

=21

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