The perimeter of a rectangle is P = 2L + 2W. If P = 40 and L = 12, what is W?
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Correct!
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Correct answer to question 72 (Mathematics Knowledge): 8
Method
Substitute and solve: 40 = 24 + 2W, so 2W = 16 and W = 8. Forgetting to halve at the end gives 16.
Updated: November 2026
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