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      Question

      Workers A and B can finish a task in 30 days when

      working together. They worked for 18 days, and then C completed the rest of the task alone in 12 days. How many days will C alone take to finish 75% of the work?
      A 22.5 Correct Answer Incorrect Answer
      B 32.5 Correct Answer Incorrect Answer
      C 62.5 Correct Answer Incorrect Answer
      D 28.4 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Fraction of work done by A and B = 18 / 30 = 3/5

      Fraction of work done by C = 1 - 3/5 = 2/5

      So, number of days taken by C alone to complete the entire work = 12 ├╖ (2/5) = 30 days

      So, time taken by C to complete 75% of the work = 30 ├Ч 0.75 = 22.5 days

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