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gmat prep question

by jamesk486 » Mon Apr 16, 2007 2:44 pm
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the table top is x square feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3 feet wide, what is its approx. length, in feet?

A 12
B 10
C 9
D 8
E 6

Got stuck...
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Re: gmat prep question

by jayhawk2001 » Mon Apr 16, 2007 7:53 pm
jamesk486 wrote:A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the table top is x square feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3 feet wide, what is its approx. length, in feet?

A 12
B 10
C 9
D 8
E 6

Got stuck...
Let l be the length of the tabletop

l * 3 = x

Also 2*l + 2*3 = x (this was the wire before it was used on the tabletop)

Equating

l*3 = 2*l + 6

Therefore l = 6
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