[email protected] wrote:"If there are 80% as many as boys as girls" - what does that mean? Does that mean 80% of boys and 80% of girls? Please look at the question below
75% of all boys and 48% of all girls of Smith High School takes civics. If there are 80% as many boys as girls, what percent of all students take civics?
There are 80% as many as boys as girls
This means that: # of boys = 80% of the number of girls
That is: # of boys = (0.80)(# of girls)
75% of all boys and 48% of all girls of Smith High School takes civics. If there are 80% as many boys as girls, what percent of all students take civics?
Let G = number of girls
So 0.8G = number of boys
75% of all boys take civics
Number of boys taking civics = 0.75(0.8G) = 0.6G
48% of all girls take civics
Number of girls taking civics = 0.48G
Total number of children taking civics = 0.6G + 0.48G =
1.08G
Total number of children in the school = G + 0.8G =
1.8G
PERCENTAGE of children taking civics = (100)(
1.08G)/(
1.8G)
= (100)(1.08)/(1.8)
= 605
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