AlgebraMediumFixed fee from two totals
Algebra practice question
A window cleaner's charge is a linear function of the number of windows. Two windows cost $28 and six windows cost $52. What is the fixed part of the charge, in dollars?
Answer: 16
The rate is 24/4 = 6 per window, so the fixed part is 28 − 12 = 16.
Common wrong answers
- If you answered 6
- 6 is the rate per window.
- If you answered 14
- 14 halves 28.
- If you answered 28
- 28 is the two-window charge.
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