AlgebraEasySheets left in a printer tray
Algebra practice question
A printer tray is loaded with 500 sheets of paper, and each report printed uses 30 sheets. Which equation gives the number of sheets s left in the tray after r reports have been printed?
- A. s = 500 − 30rCorrect
- B. s = 500 + 30r
- C. s = 30 − 500r
- D. s = 500r − 30
Answer: A. s = 500 − 30r
Start at 500 and remove 30 per report.
Why the other answers are wrong
- B. s = 500 + 30r
- Adding 30 per report would fill the tray.
- C. s = 30 − 500r
- This swaps the starting amount and the rate.
- D. s = 500r − 30
- This multiplies the starting amount by the number of reports.
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