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posted by Anonymous Tuesday, July 12, 2011 at 7:59am.
After working 4 hours, Frank has made 21 machine parts. At the same rate, how many parts can he make in 7 hours? A) (21/4)*7 B) 7(21) C) 7(4) /21 D) 7(4)(21)
solve 21/4 = x/7
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