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Railways PYQCBT 1 2020

RRB NTPC · Question 20

The total cost of flooring a room at Rs. 12.50 per m^2 is Rs. 3 ,675. If the breadth and length are in the ratio 2 : 3, find its length.

  1. 18 m

  2. 15 m

  3. 14 m

  4. 21 m

Show answer & explanation

Answer: (D) 21 m

Explanation

Area = 3675/12.5 = 294 m² = 2k × 3k = 6k², so k² = 49 and k = 7. Length = 3k = 21 m.