SOLUTION: A class consisting of 30 girls and 40 boys sponsored a Halloween dance. If 60 percent of the girls and 25 percent of the boys went to the dance, what percent of the entire class we

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Question 259959: A class consisting of 30 girls and 40 boys sponsored a Halloween dance. If 60 percent of the girls and 25 percent of the boys went to the dance, what percent of the entire class went to the dance?
a)30 % b) 40 % c) 45 % d) 70 % e) 85 %

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A class consisting of 30 girls and 40 boys sponsored a Halloween dance. If 60 percent of the girls and 25 percent of the boys went to the dance, what percent of the entire class went to the dance?
:
Let x = per cent of entire class (as a decimal)
:
70x = .60(30) + .25(40)
70x = 18 + 10
70x = 28
x = 28/70
x = .4 = 40% of the entire class