SOLUTION: 40% of the student in a school are girls.If the total number of girls in the school is 420. Find the number of student in the school. Also, find the of boys in the school.

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Question 1115591: 40% of the student in a school are girls.If the total number of girls in the school is 420. Find the number of student in the school. Also, find the of boys in the school.
Found 2 solutions by Fombitz, MathTherapy:
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!

and

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Solve for , then solve for

Answer by MathTherapy(10555)   (Show Source): You can put this solution on YOUR website!

40% of the student in a school are girls.If the total number of girls in the school is 420. Find the number of student in the school. Also, find the of boys in the school.
Just use a proportion, as follows: , with S being the number of students in the school. Solve this for S.

I think you should be able to find out how many boys there are, considering that you already know the total number of students (S) as well as the number of girls. 

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