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A farmer has a field that measures 1000 ft wide by 2000 ft

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sudhagar
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A farmer has a field that measures 1000 ft wide by 2000 ft [#permalink] New post   06 Nov 2005, 13:12
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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, and 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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Re: A farmer has a field that measures 1000 ft wide by 2000 ft [#permalink] New post   07 Nov 2005, 20:51
Thats correct OA is B. I miscalculated, the edge to be on only one side and arrived at 98% :-(
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Re: A farmer has a field that measures 1000 ft wide by 2000 ft [#permalink] New post   08 Nov 2005, 19:22
bewakoof wrote:
explain, dost?


Pls let me know whether you need explanation for correct answer or the wrong one
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Re: A farmer has a field that measures 1000 ft wide by 2000 ft [#permalink] New post   09 Nov 2005, 13:58
sudhagar wrote:
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, and 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%


(B)

Tillable area = TA = (960 * 1960) - (30 * 960)
Total Area of field = F = 2000 * 1000

TA = x * F / 100 = 92.64 = 93%



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Re: A farmer has a field that measures 1000 ft wide by 2000 ft [#permalink]
09 Nov 2005, 13:58
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