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## test18 #8

This topic has 1 member reply
dunkin77 Master | Next Rank: 500 Posts
Joined
01 Apr 2007
Posted:
269 messages

#### test18 #8

Sun Apr 29, 2007 11:42 pm
Hi,

I thought the answer was E) but it says correct choice is A) - Can you please explain??
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bww Senior | Next Rank: 100 Posts
Joined
29 Apr 2007
Posted:
55 messages
1
Mon Apr 30, 2007 6:29 pm
Hi there,

Perhaps someone will (and should) give a more technical answer, but I look at it this way.

For 1), cross-multiply to get: pxq=qyp. You can simplify by dividing each side by "p" and "q," which produces x=y. Thus, 1) is sufficient, because we can mathematically answer the question.

2) xy=p doesn't tell us much. We can determine that the product of "x" and "y" equals "p," so "x" and "y" are probably smaller values than "p," but that's useless in answering the question. So, 2) is insufficient.

The answer is A because 1) alone is sufficient to answer the question, but 2) alone is not sufficient.

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