AlgebraEasy–MediumNumber of long planks from a total length
Algebra practice question
A carpenter cuts a 30-foot board into some 2-foot pieces and three 4-foot pieces, using the whole board. How many 2-foot pieces does the carpenter cut?
Answer: 9
2p + 12 = 30 gives 2p = 18, so p = 9.
Common wrong answers
- If you answered 15
- 15 divides 30 by 2, ignoring the 4-foot pieces.
- If you answered 18
- 18 is the total length of the 2-foot pieces.
- If you answered 21
- 21 adds 12 before dividing.
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