315pounds/week * 1week/37.5hr = 8.4pounds/hr
Look at the units. The weeks will cancel out and you will get hours. With the problems the best way to solve them is by thinking of unit cancellation.
total = (# of hours) * (hourly rate)
divide each side by # of hours
315 divided by 37 1/2 = 8.4
She gets 8.40 per hour
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