πŸ“’ Too many exams? Don’t know which one suits you best? Book Your Free Expert πŸ‘‰ call Now!


    ⚑ Azaadi sale - Celebrate Independence Day with Flat 55% Off On all courses! 13 to 17 Aug ⚑ Enroll Now

    Question

    A work can be completed by β€˜A’ and β€˜B’, alone in

    20 days and 10 days, respectively. Find the number of days taken by β€˜C’ to complete the same work alone if β€˜A’, β€˜B’ and β€˜C’ together can complete the whole work in 4 days.
    A 8 days Correct Answer Incorrect Answer
    B 5 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 7 days Correct Answer Incorrect Answer

    Solution

    Let total work = 20 units (LCM of 20 and 10) Efficiency of β€˜A’ = (20/20) = 1 units/day Efficiency of β€˜B’ = (20/10) = 2 units/day Combined efficiency of β€˜A’, β€˜B’ and β€˜C’ = (20/4) = 5 units/day Efficiency of β€˜C’ = 5 – (1 + 2) = 2 units/day Required time taken = (20/2) = 10 days

    Practice Next
    ask-question

    Not sure which exam is best for you Talk to our expert

    Get My Free Call