Philip P. answered 08/10/14
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Since the man is giving away all of the 6acres, then the fractions given to his son and nephew must add up to one:
(Fraction given to son) + (Fraction given to nephew) = 1
3/4 + (Fraction given to nephew) = 1
Fraction given to nephew = 1 - 3/4
Fraction given to nephew = 1/4
So the nephew gets 1/4 of the 6 acres:
(6 acres)*(1/4) = 1.5 acres
There are 43,560 square feet in one acre. To convert 1.5 acres to square feet, multiply by 43,560.