AlgebraEasy–MediumTwo piles of coins from a total and a relation
Algebra practice question
Two piles hold 13 coins in total. The larger pile has one more than twice the coins in the smaller pile. How many coins are in the larger pile?
Answer: 9
s + (2s + 1) = 13 gives s = 4, so the larger pile has 9.
Common wrong answers
- If you answered 4
- 4 is the smaller pile.
- If you answered 8
- 8 is twice 4 without the extra 1.
- If you answered 6.5
- 6.5 halves 13.
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