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    Question

    36 workers are digging a tunnel 5 km long. After working

    for 20 days, only 2/3 of the tunnel is completed. Then 4 more workers join the team. How many days are required to finish the remaining part?
    A 5 days Correct Answer Incorrect Answer
    B 9 days Correct Answer Incorrect Answer
    C 12 days Correct Answer Incorrect Answer
    D 18 days Correct Answer Incorrect Answer

    Solution

    ATQ, Let the number of days to complete the remaining work be x. (36 × 20) / (2/3 × 5) = 40x / (1/3 × 5) (36 × 20) / (10/3) = 40x / (5/3) 216 = 24x x = 9 days

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