Question

Janine worked 15 hours last week. One job as a clerk in a sporting goods store paid her ​$8.47 per​ hour, while her job giving piano lessons paid ​$17 per hour. If she earned ​$178.23 between the two​ jobs, how many hours did she work at each​ job?

Answer 1

she worked 9 hours at sporting goods store and 6 hours on piano lessons.

Explanation:

total hours=15

8.47x + 17(15-x) = 178.23

8.47x + 225 - 17x = 178.23

225 - 178.23 = 17x - 8.47x

76.77 = 8.53x

x = 76.77 / 8.53

x = 9

therefore she worked 9 hours at sporting goods centre and the remaining hours (15-9) giving piano lessons.