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    Question

    β€˜P’ and β€˜Q’ together can complete a work in 30

    days. If β€˜P’ increases his efficiency by 50% and β€˜Q’ decreases his efficiency by 50%, then the total time taken remains unchanged. Find the ratio of efficiencies of β€˜P’ and β€˜Q’, respectively.
    A 1:2 Correct Answer Incorrect Answer
    B 2:1 Correct Answer Incorrect Answer
    C 3:2 Correct Answer Incorrect Answer
    D 2:3 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the efficiency of β€˜P’ and β€˜Q’ be β€˜x’ units/day and β€˜y’ units/day, respectively. So, total work = {(x + y) Γ— 30} units After change in efficiencies, Also, total work = (1.5x + 0.5y) Γ— 30 So, (1.5x + 0.5y) Γ— 30 = (x + y) Γ— 30 Or, 1.5x + 0.5y = x + y Or, 0.5x = 0.5y Or, x : y = 1 : 1 So, ratio of efficiency of β€˜P’ and β€˜Q’ = 1 : 1

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