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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 ├Ч 18) / (3/5 ├Ч 6) = 40x / (2/5 ├Ч 6) (30 ├Ч 18) / (18/5) = 40x / (12/5) 150 = 40x / (12/5) 150 = (40x ├Ч 5) / 12 150 = (200x) / 12 150 ├Ч 12 = 200x 1800 = 200x x = 9 days

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