SOLUTION: In a class 40% are girls and the rest are boys. If 15 girls are added in the class,then 52% girls would be there. Find the number of boys and girls in the beginning?

Question 917735: In a class 40% are girls and the rest are boys. If 15 girls are added in the class,then 52% girls would be there. Find the number of boys and girls in the beginning?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
x for girls, y for boys

system(x/(x+y)=0.4,y/(x+y)=0.6)
but x+y is not known

Concentrate just on how many girls.
Let p be number of students.

Add 15 more girls.

Also you expect

The description gives this system:

Use the first two equations to solve for x and p using substitution.

Now p and x are known.

RESULT:
-------------------------
Girls,24
Boys,36
How Many Students, 60
-------------------------

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