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smclean23: Master | Next Rank: 500 Posts; Posts: 172; Joined: Mon Jun 23, 2008 12:00 pmFollowed by: 1 member; Thanked: 3 times

by smclean23 » Thu Aug 07, 2008 7:09 pm

What is the area of a rectangular surface that has length x feet and width y feet ?

(1) y is the reciprocal of x.
(2) The perimeter of the rectangular surface is 5 feet.

Answer is A.

How?

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Source: Beat The GMAT — Data Sufficiency | Thu Aug 07, 2008 7:09 pm

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Thu Aug 07, 2008 8:20 pm

The answer is indeed A.

Area of the rectangle = xy =?

Statement I

x=1/y

xy=1

Hence Sufficient.

Statement II

2(x+y)=5
x+y=5/2

hence Insufficient.

Answer is A.

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