The formula for perimeter of a rectangle is P = 2L + 2W. If P = 30 and W = 4, what is L?
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Correct answer to question 140 (Mathematics Knowledge): 11
Method
Substitute the known values: 30 = 2L + 8. Subtract 8 to get 2L = 22, then divide by 2 to get L = 11.
Updated: November 2026
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