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    Question

    Ankit can finish 25% of a task in

    4 days. Bhuvan is 20% less efficient than Ankit. How many days will it take for both of them to complete 90% of the task if they work together?
    A 18 days Correct Answer Incorrect Answer
    B 12 days Correct Answer Incorrect Answer
    C 8 days Correct Answer Incorrect Answer
    D 10 days Correct Answer Incorrect Answer

    Solution

    ATQ, ‘Ankit’ can complete whole work alone in 4/0.25 = 16 days ‘Bhuvan’ can complete the whole work in = 16/0.80 = 20 days Let the total work = 80 units Efficiency of ‘Ankit’ = 80/16 = 5 units/day Efficiency of ‘Bhuvan’ = 80/20 = 4 units/day Required time taken = 0.9 × 80/(5 + 4) = 8 days

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