AlgebraHardMiles from a taxi fare
Algebra practice question
A taxi charges $3.50 plus $2.25 for each mile. A ride cost $21.50. How many miles long was the ride?
Answer: 8
3.5 + 2.25m = 21.5 gives 2.25m = 18, so m = 8.
Common wrong answers
- If you answered 18
- 18 is the cost of the miles, not the number of miles.
- If you answered 9.56
- 9.56 divides 21.5 by 2.25, forgetting the flag fall.
- If you answered 11.11
- 11.11 divides 25 by 2.25, adding the flag fall instead of subtracting.
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