AlgebraEasy–MediumEquation for a shrinking stack of paper
Algebra practice question
A printer tray holds 250 sheets and uses 5 sheets per document. Which equation gives the number of sheets s left after d documents have been printed?
- A. s = 250 − 5dCorrect
- B. s = 250 + 5d
- C. s = 5 − 250d
- D. s = 250d − 5
Answer: A. s = 250 − 5d
Start at 250 and lose 5 per document.
Why the other answers are wrong
- B. s = 250 + 5d
- Adding would fill the tray.
- C. s = 5 − 250d
- This swaps the start and the rate.
- D. s = 250d − 5
- This multiplies the start by d.
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