The length and breadth of a rectangular room are in the ratio 4 : 3 and its floor area is 432 sq m. What is the perimeter of the floor?
Correct answer D. 84 m
Explanation
12k² = 432 gives k² = 36, k = 6. Length = 24 m, breadth = 18 m. Perimeter = 2(24 + 18) = 84 m.
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