AlgebraEasy–MediumMinutes from a linear cost
Algebra practice question
A ride-share company charges a fixed $3 plus $0.50 per minute. How many minutes long is a ride that costs $18?
Answer: 30
18 = 3 + 0.5m, so 0.5m = 15 and m = 30.
Common wrong answers
- If you answered 36
- 36 divides 18 by 0.5 without first removing the fixed $3.
- If you answered 42
- 42 adds the $3 instead of subtracting it: (18 + 3)/0.5.
- If you answered 7.5
- 7.5 multiplies 15 by 0.5 instead of dividing.
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