56 feet (simply divide 672 by 12)
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672 inches=56 feet
672 ÷ 8 = 84
672 ÷ 3 = 224
There are infinitely many pairs. Pick any non-zero number, X and let Y = 672/X. Then X*Y = X*(672/X) = 672. And, since the choice of X was arbitrary, then there are infinitely many such pairs. There are also infinitely many sets of 3, 4 5, ... numbers which will multiply to 672.
16 goes into 672 42 times.