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Sides of a rectangular park are in the ratio 3: 2 and its area is 3750 sq m, the cost of fencing it at 50 ps per meter is_______?

Correct answer: C. Rs.125

  • A. Rs.150
  • B. Rs.100
  • C. Rs.125
  • D. Rs.175

Explanation

Let the sides be 3x m and 2x m. Then 3x x 2x = 3750 m², so x² = 625 m² and x = 25 m; the sides are 75 m and 50 m, giving perimeter 250 m. At Rs 0.50 per metre, the cost is 250 m x Rs 0.50/m = Rs 125. Students may choose option a by confusing the area calculation with the fencing cost.

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