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A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?

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answer is D.

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Detailed Solution

One side of rectangle $= 20$ feet

Area of rectangle $= 680$ feet

$∴$ Other side of rectangle $= \frac{680}{20}$

$= 34$ feet.

So, fencing will be required $= 34 + 34 + 20$

$= 88$ feet

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