AlgebraEasy–MediumWeekly spending from savings
Algebra practice question
Kofi had saved $84. He spent the same amount each week, and after 7 weeks he had $21 left. How many dollars did he spend each week?
Answer: 9
84 − 7s = 21 gives 7s = 63, so s = 9.
Common wrong answers
- If you answered 3
- 3 divides 21 by 7.
- If you answered 12
- 12 divides 84 by 7, ignoring the $21 left.
- If you answered 15
- 15 adds 21 to 84 before dividing.
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