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    Question

    40 men or 50 women can build a wall in 30 days. If 40

    men and 50 women work together, how many days will they take to complete 60% of the work?
    A 9 days Correct Answer Incorrect Answer
    B 5 days Correct Answer Incorrect Answer
    C 12 days Correct Answer Incorrect Answer
    D 18 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let efficiency of each man and woman be M and W units/day respectively. So, 40M ├Ч 30 = 50W ├Ч 30 тЗТ 4M = 5W Total work = 40M ├Ч 30 = 1200M units Combined efficiency = 40M + 50W = 40M + 40M = 80M units/day (Since 50W = 40M using 4M = 5W) Required time for 60% of the work = 0.60 ├Ч (1200M / 80M) = 9 days

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