Posted by **Anonymous** on 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)

- math -
**Reiny**, Tuesday, July 12, 2011 at 8:06am
solve

21/4 = x/7

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