AlgebraEasy–MediumHours from a plumber's bill
Algebra practice question
A plumber charges a $40 call-out fee plus $25 for each hour of work. The bill is given by B = 40 + 25h. For a bill of $165, how many hours did the plumber work?
Answer: 5
40 + 25h = 165 gives 25h = 125, so h = 5.
Common wrong answers
- If you answered 125
- 125 is the charge for the hours, not the hours.
- If you answered 6.6
- 6.6 divides 165 by 25, ignoring the fee.
- If you answered 8.2
- 8.2 divides 205 by 25, adding the fee instead of subtracting.
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