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10 Sep 2010, 15:29
Kudos
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E
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Difficulty:
15%
(low)
Question Stats:
80% (01:15) correct
20%
(01:20)
wrong
based on 551
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Do more than 50% of the children in a certain group have brown hair?
1) 70 % of the boy in the group have brown hair.
2) 30% of the children in the group are girls with brown hair.
1) 70 % of the boy in the group have brown hair.
2) 30% of the children in the group are girls with brown hair.
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10 Sep 2010, 16:08
Kudos
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cmugeria
This one is straight E, we know nothing about the ratio of # of boys to the # of girls in the group.
Question: is (# of children with brown hair in the group)/(total # of children in the group)>0.5?
Consider total # of children in the group to be 100. Now, even when we combine two statements we would have the following: 30 children are girls with brown hair and 70% of the boys have brown hair. If # of boys is 10 then 7 boys would have brown hair and total # of children with brown hair would be 30+7=37<50. But if # of boys is 70 (in this case there would be only 30 girls in the group and all girls in the group would have brown hairs) then 49 boys would have brown hair and total # of children with brown hair would be 30+49=77>50.
Answer: E.
General Discussion
10 Sep 2010, 15:35
Kudos
Bookmarks
heres how i thought about it:
even if you know the percentages, you still dont know the # of boys and girls in the group.
that makes it impossible to solve this hence E. (70% of Boys , 30% of girls but total # will make the final determination).
Venn diagrams could be used if there was more info....
even if you know the percentages, you still dont know the # of boys and girls in the group.
that makes it impossible to solve this hence E. (70% of Boys , 30% of girls but total # will make the final determination).
Venn diagrams could be used if there was more info....
