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      Question

      30 workers are laying a 6 km railway track. After 18

      days, they finish 3/5 of the total work. To speed it up, 10 more workers are added. How many days will it take to lay the remaining track?
      A 25 days Correct Answer Incorrect Answer
      B 9 days Correct Answer Incorrect Answer
      C 10 days Correct Answer Incorrect Answer
      D 12 days Correct Answer Incorrect Answer

      Solution

      ATQ, Let the number of days to complete the remaining work be x. (30 × 18) / (3/5 × 6) = 40x / (2/5 × 6) (30 × 18) / (18/5) = 40x / (12/5) 150 = 40x / (12/5) 150 = (40x × 5) / 12 150 = (200x) / 12 150 × 12 = 200x 1800 = 200x x = 9 days

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