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      Question

      The time taken by β€˜A’ to build a wall alone is 35%

      more than the time taken by him to build it along with β€˜B’. β€˜B’ will take how much percent more time to build the same wall than the time taken by him to build it along with β€˜A’?
      A 225.71% Correct Answer Incorrect Answer
      B 235.71% Correct Answer Incorrect Answer
      C 285.71% Correct Answer Incorrect Answer
      D 215.71% Correct Answer Incorrect Answer

      Solution

      Let the work β€˜A’ and β€˜B’, can do in 1 day be β€˜a’ units and β€˜b’ units, respectively. Let they takes β€˜p’ days to build the wall, together Therefore, Total work = (a + b) Γ— p units …….. (1) According to the question, Time taken by β€˜A’ to build the wall alone = 1.35p days Therefore, total work = 1.35p Γ— a units….. (2) From equation (1) and (2), we get 20b/7 = a Therefore, total work to be done = (a + b) Γ— p = 27bp/7 units Time taken by 'B' to build the wall = 27bp/7b = 27p/7 days Therefore, required percentage = (27p/7 – p)/p} Γ— 100 = 285.71% more time

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