Square A has an area of 25 square centimeters. Square B has

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Square A has an area of 25 square centimeters. Square B has [#permalink]

01 Oct 2005, 22:49

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Square A has an area of 25 square centimeters. Square B has a perimeter of 16 centimeters. If square B is placed within square A and a random point is chosen within square A, what is the probability the point is not within square B?

A. 9/25
B. 1/5
C. 16/25
D. 3/5
E. 6/25

Last edited by Bunuel on 21 Feb 2012, 01:20, edited 1 time in total.

Edited the question and added the OA

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Re: Square A has an area of 25 square centimeters. Square B has [#permalink]

21 Feb 2012, 01:19

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GMATT73 wrote:

I guess it's mean that square B is placed within square A entirely.

Since, the perimeter of B is 16, then its side is 16/4=4 and the area is 4^2=16;

Empty space between the squares is 25-16=9 square centimeters, so if a random point is in this area then it won't be within square B: P=favorable/total=9/25.

Answer: A.
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Re: Square A has an area of 25 square centimeters. Square B has [#permalink] 21 Feb 2012, 01:19

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Square A has an area of 25 square centimeters. Square B has

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Square A has an area of 25 square centimeters. Square B has

Square A has an area of 25 square centimeters. Square B has

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