SOLUTION: a class has 90 students. if the ratio of boys and girl is 7:8 ; find the number of boys in the class.

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Question 856441: a class has 90 students. if the ratio of boys and girl is 7:8 ; find the number of boys in the class.

Answer by rvfer(117) About Me  (Show Source):
You can put this solution on YOUR website!
7x+8x=90
15x=90
x=90/15
x=6
7*6=42 boys