What is the ratio of the cost of flooring to that of fencing of field D?

4:1

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6:1

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8:1

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9:1

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5:1

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Solution

The correct option is D
9:1

Area of D = $B a s e \times H e i g h t = 20 \times 12 = 240 s q . m$
So, cost of flooring of D = $240 \times 60 = R s .14400$
Perimeter of D = 2(20+12) = 64m
So, cost of fencing of D = $64 \times 25 = R s . 1600$
So, required ratio = 14400:1600 = 9:1

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m^{2}

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