AlgebraEasy–MediumTwo lengths from a total and a relation
Algebra practice question
A ribbon 13 metres long is cut into two pieces. The longer piece is 1 metre more than twice the shorter piece. How long, in metres, is the shorter piece?
Answer: 4
s + (2s + 1) = 13 gives 3s = 12, so s = 4.
Common wrong answers
- If you answered 9
- 9 is the longer piece.
- If you answered 6.5
- 6.5 halves 13.
- If you answered 4.33
- 4.33 divides 13 by 3, ignoring the extra metre.
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