Posted by **Anonymous** on Thursday, January 26, 2012 at 3:57pm.

After working 4 hours frank made 21 machine parts. it's the same rate how many parts can he make in 7 hours

- math -
**PsyDAG**, Friday, January 27, 2012 at 8:35pm
21/4 = x/7

Solve for x.

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