AlgebraMediumFewest hours to clear a minimum
Algebra practice question
A worker earns $8 per hour and must pay a $40 transport pass each week. What is the fewest number of whole hours the worker must work in a week to have at least $80 left after paying for the pass?
Answer: 15
8h − 40 ≥ 80 gives 8h ≥ 120, h ≥ 15. The fewest whole hours is 15.
Common wrong answers
- If you answered 5
- 5 subtracts 40 from 80 before dividing: (80 − 40)/8.
- If you answered 10
- 10 ignores the $40 pass (80 ÷ 8).
- If you answered 14
- 14 hours leaves only $72.
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