Section: Mathematical Reasoning

20) 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:
4 / 21 = 7 / x
4x = 7(21)
x = 7(21) /4

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