Ben earns $9 per hour and $6 for each delivery he makes. He wants to earn more than$155 in an 8-hour workday. What is the least number of deliveries he must make to reach his goal?

8 hours is given

8*9=72

now deliveries

72+delivieries>155

deliveries=6 times number of deliveries (let's say 'd')

72+6d>155

minus 72 both sides

6d>83

divide both sides by 6

d>13.83

can't make 0.83 delivieries, round up

d=14

needs to do at least 14 deliveries