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8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    A can do a job in 6 days, B alone can do it in 8 days and C alone can finish the job in 24 days. A and B together are paid Rs.3 50. Then how much money is paid to C?

    A) Rs.50            

    B) Rs. 40

    C) Rs.70                    

    D) Rs.150

    Correct Answer: A

    Solution :

    Ratio of payments = ratio of one day's work \[{{a}_{1}}{{b}_{2}}={{a}_{2}}{{b}_{1}}\] We have, for \[\Rightarrow \]parts, the payment is Rs. 350. For 1 part the payment \[\frac{{{a}_{1}}}{{{a}_{2}}}=\frac{{{b}_{1}}}{{{b}_{2}}}\]              


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