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PS-percentage & geometry

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Director
Joined: 04 Jan 2008
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01 Apr 2009, 01:09
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A farmer has a field that measures 1000 ft wide by 2000 ft long. There is an untillable strip 20 ft wide on the inside edge of the field. In addition, there is a 30 ft wide untillable strip bisects the field into two squares (approximate). Approximately what percentage of the field is tillable?

A) 98%

B) 93%

C) 91%

D) 90%

E) 88%

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Joined: 13 Jan 2009
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Location: India

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01 Apr 2009, 15:57
= (2000-70)*(1000-40)/2000*1000 *100 %
nearly 93%
-70 because 20+20+30 ( 20 each side and 30 width of the other areat..to have square it has be length wise)
Director
Joined: 04 Jan 2008
Posts: 893

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02 Apr 2009, 01:51
Thanks
Its simple now
hemantsood wrote:
= (2000-70)*(1000-40)/2000*1000 *100 %
nearly 93%
-70 because 20+20+30 ( 20 each side and 30 width of the other areat..to have square it has be length wise)

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http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Re: PS-percentage & geometry   [#permalink] 02 Apr 2009, 01:51
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