AlgebraVery hardWeekend hours from a week's pay
Algebra practice question
A worker is paid 15 dollars per hour on weekdays and 22.50 dollars per hour at weekends. In one week she worked 40 hours in total and earned 690 dollars. How many of her hours were at the weekend?
Answer: 12
With w weekend hours, 15(40 − w) + 22.5w = 690 gives 600 + 7.5w = 690, so w = 12.
Common wrong answers
- If you answered 6
- 6 uses 15w instead of 7.5w.
- If you answered 28
- 28 is the number of weekday hours.
- If you answered 46
- 46 divides 690 by 15.
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