rectangular surface?

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grandh01: Master | Next Rank: 500 Posts; Posts: 265; Joined: Tue Jul 03, 2012 11:04 pmFollowed by: 6 members

by grandh01 » Sun Aug 12, 2012 5:41 pm

24. 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.

OA is A

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Source: Beat The GMAT — Data Sufficiency | Sun Aug 12, 2012 5:41 pm

theCEO: Master | Next Rank: 500 Posts; Posts: 363; Joined: Sun Oct 17, 2010 3:24 pmFollowed by: 3 members; Thanked: 115 times

by theCEO » Sun Aug 12, 2012 6:27 pm

grandh01 wrote:24. 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.

OA is A

We want to find area xy

1.
y is the reciprocal of x means that y = 1/x
area = xy = x * 1/x = 1
sufficient

2.
2x + 2y = 5
2(x+y) = 5
x+y = 2.5
x and y could have any value
insufficient

ans=a

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