After working 4 hours, Frank has made 21 machine parts. At the same rate, how many parts can he make in 7 hours?
Explanation
Let x = number of machine parts Frank can make in 7 hr.
Set up a proportion:
\(\frac{4}{21}=\frac{7}{x}\)
\(4 x=7\times 21\)
\(x = (7\times 21) \div 4\)
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