The number of hours that the jet ski was rented is 7 hours.
Let the number of hours used in renting the jet ski be represented by h.
Based on the information given, the equation to solve the question will be:
40 + 50(h) = 390
40 + 50h = 390
Collect like terms
50h = 390 - 40
50h = 350
h = 350/50
h = 7
There, the number of hours that the jet ski was rented is 7 hours.
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