ssp4all
In the recent electoral polls, 15% of the voter turnout were under the age of 30 and were females. If 50% of the voter turnout under the age of 30 were not females, what percent of the voter turnout under the age of 30?
A) 25%
B) 30%
C) 45%
D) 57%
E) 65%
Make a matrix..
..............M ......F........total
<30......t/2_.....15...t
So t/2+15=t......t/2=15....t=30%
Also if 50% are not females, the other 50% will be females and this is 15%of Total
So total will be 15*2=30%
STEP by STEP ( say there are 100 voters)
1) 15% of the voter turnout were under the age of 30 and were females.... so 15 voters are BOTH <30 and F.
2)50% of the voter turnout under the age of 30 were not females,..say Total voters <30 be x, so x/2 are males and x/2 are females
3) but we know that BOTH <30 and F =15=x/2...x=30
so 30% of total
see attached diagram
ssp4all please refer your below post
B
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