SOLUTION: if 3/4 of the pupils were boys and there were 240 girls,how many boys were in the school?

Question 825151: if 3/4 of the pupils were boys and there were 240 girls,how many boys were in the school?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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N = number of students
b = number of boys
g = number of girls
---
N = b + g
b = (3/4)N
b = (3/4)(b + g)
b = (3/4)(b + 240)
b = (3/4)b + (3/4)240
b - (3/4)b = (3/4)240
(4/4)b - (3/4)b = (3/4)240
(1/4)b = (3/4)240
b = 4(3/4)240
b = (3)240
---
answer:
b = 720
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