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Junior | Next Rank: 30 Posts
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GMAT Prep

by KL08 » Sun Sep 23, 2007 7:45 am
On a certain sight-seeing tour, the ratio of the number of women to the number of children was 5 to 2. What was the number of men on the sight-seeing tour?

1) On the sight-seeing tour, the ratio of the number of children to the number of men was 5 to 11.
2) The number of women on the sight-seeing tour was less than 30

OA is C.
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by cindyqtran » Sun Sep 23, 2007 8:59 am
hi.

are you sure the answer is C?

I would think it is E, because even though you have the ratios for each, answer B just states that the number of Women is less than 30 (i.e. 5, 10, 15, 20 , 25). Because this is not a constant value, we cannot determine the values of the others.
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Junior | Next Rank: 30 Posts
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by KL08 » Sun Sep 23, 2007 9:10 am
Yes, I picked E also, but somehow the oa is showed as C.
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by agps » Sun Sep 23, 2007 9:28 am
the trick is that you can't have 3/4 children or men on the trip, it must be an integer.

1) tells you that the number of children must be a multiple of 5, actually, must be a multiple of 10, because multiples of 5 ending in 5 are not multiples of 2 (2 children for each 5 women) so, 10, 20, 30, all are possible, insufiicient.

2) women are less than 30, by itself insufficient, can be any number.

together.
women less tahn 30 and chilren multiple of 10, so must be 25 women and 10 children, otherwise children are not a multiple of 10. so the men are 22. C is the answer
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by cindyqtran » Sun Sep 23, 2007 9:33 am
oh duh, so basically W has to be a number such that C will be a multiple of 2 and 5...
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