AlgebraHardStarting balance from two later balances
Algebra practice question
A savings jar's contents grow by the same amount each week. After 2 weeks it holds $22 and after 8 weeks it holds $46. How many dollars did the jar hold at the start?
Answer: 14
The weekly growth is 24/6 = 4, so the start was 22 − 8 = 14.
Common wrong answers
- If you answered 4
- 4 is the weekly growth.
- If you answered 11
- 11 halves 22.
- If you answered 18
- 18 subtracts one week's growth only.
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