AlgebraEasy–MediumNumber of items from a remaining amount
Algebra practice question
A roll of ribbon is 36 metres long. After 7 equal pieces are cut from it, 8 metres remain. How long, in metres, is each piece?
Answer: 4
36 − 7p = 8, so 7p = 28 and p = 4.
Common wrong answers
- If you answered 28
- 28 is the total length cut, not one piece.
- If you answered 5.1
- 5.1 divides 36 by 7, ignoring the 8 metres that remain.
- If you answered 6.3
- 6.3 divides 44 by 7, adding the 8 instead of subtracting.
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