AlgebraEasy–MediumMost items within a budget with a fixed charge
Algebra practice question
A taxi charges a $15 flat fee plus $4 per kilometre. A passenger has $65. What is the greatest whole number of kilometres the passenger can travel?
Answer: 12
15 + 4k ≤ 65 gives 4k ≤ 50, k ≤ 12.5, so 12 kilometres.
Common wrong answers
- If you answered 13
- 13 km would cost $67.
- If you answered 16
- 16 divides 65 by 4, ignoring the flat fee.
- If you answered 20
- 20 comes from (65 + 15)/4, adding the fee instead of subtracting.
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