Phone Bill

​A phone company charges a monthly rate of $12.95 and $0.25 a minute per call. If the bill for this month totaled $21.20, how many minutes were charged on this bill?

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Let the variable represent what is to be found.

x = number of minutes

0.25x + 12.95 = 21.20   {price per minute times number of minutes plus monthly rate equals total bill}
0.25x = 8.25   {subtracted 12.95 from each side}
x = 33   {divided each side by 0.25}

33 minutes were charged

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