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Alter 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:

\(\frac{4}{21}=\frac{7}{x}\)

\(4x=7\times21\)
\(x=\frac{7\times21}{4}=36.75\)

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