SOLUTION: Please help me to solve the problem. In a school 720 are boys and 40% are girls. Find the number of girls?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Please help me to solve the problem. In a school 720 are boys and 40% are girls. Find the number of girls?       Log On


   

Question 1062620: Please help me to solve the problem. In a school 720 are boys and 40% are girls. Find the number of girls?

Found 3 solutions by rfer, josgarithmetic, MathTherapy:
Answer by rfer(16322) About Me  (Show Source):
Answer by josgarithmetic(39628) About Me  (Show Source):
You can put this solution on YOUR website!
40%+60%=100%

60% is for the proportion of boys.

p is school population:
%2860%2F100%29p=720


p=720%2810%2F6%29

p=%2836%2A2%2A10%2A10%29%2F6

p=1200---------students in the school.


40% of p are girls.
1200%2A%280.4%29
12%2A4%2A10
480%2Agirls

Answer by MathTherapy(10556) About Me  (Show Source):
You can put this solution on YOUR website!
Please help me to solve the problem. In a school 720 are boys and 40% are girls. Find the number of girls? 
This is a SIMPLE, SIMPLE proportion problem.

As 40% (.4) are girls, 60% (.6) are boys, which also happens to be 720. 

With G being the number of girls, we have: .6%2F.4+=+720%2FG

.6G = .4(720) ------- Cross-multiplying

G, or number of girls = highlight_green%28.4%28720%29%2F.6+=+480%29

It's that SIMPLE....nothing COMPLEX and/or CONFUSING!