Many problems can be set up as a ratio and becomes very easy to solve.

Sample Problem

If Mary worked 24 hours and received $276.72, how many hours would she need to work to receive $564.97?


First, set the problem up as a ratio:

24/276.72 = x/564.97
Cross multiply:
24(564.97)= 276.72x
solve for x by dividing both sides by 276.72
x= 49 Mary will need to work 49 hours

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