Question

    Neha and Seema can finish a work in 10 days and 25 days,

    respectively, when working alone. Neha started the work. After how many days should Seema join to complete the entire task in 9 days?
    A 6.5 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 8.5 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total work be 50 units (LCM of 10 and 25)

    Efficiency of Neha = (50 / 10) = 5 units/day

    Efficiency of Seema = (50 / 25) = 2 units/day

    Let Seema join after 'n' days.

    So, 5n + (5 + 2) ├Ч (9 - n) = 50

    тЗТ 5n + 63 - 7n = 50

    тЗТ 2n = 13

    тЗТ n = 6.5

    Practice Next
    More Time and work Questions
    ask-question