SOLUTION: Lisa worked fifteen hours last week. One job as a clerk that paid $5.25 per hour, while her second job as a piano instructor paid $12.00 per hour. If she earned a total of $119.25

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Question 704864: Lisa worked fifteen hours last week. One job as a clerk that paid $5.25 per hour, while her second job as a piano instructor paid $12.00 per hour. If she earned a total of $119.25 between two jobs, how many hours did she work as a piano instructor?
Answer by nerdybill(7384) About Me  (Show Source):
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Lisa worked fifteen hours last week. One job as a clerk that paid $5.25 per hour, while her second job as a piano instructor paid $12.00 per hour. If she earned a total of $119.25 between two jobs, how many hours did she work as a piano instructor?
Let x = hours worked as a piano instructor
then
15-x = hours worked as a clerk
.
12x + 5.25(15-x) = 119.25
12x + 78.75-5.25x = 119.25
6.75x + 78.75 = 119.25
6.75x = 40.50
x = 6 hours