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      Question

      Average of 20 numbers is 90. Average of first 8 numbers

      is 114 while average of last nine numbers is 40. If ninth number is 25% less than the tenth number which is equal to the eleventh numbers then find the tenth number.
      A 182 Correct Answer Incorrect Answer
      B 172 Correct Answer Incorrect Answer
      C 192 Correct Answer Incorrect Answer
      D 162 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Sum of ninth, tenth and eleventh number = 20 ร— 90 โ€“ 8 ร— 114 โ€“ 9 ร— 40 = 528 Let tenth number = x = eleventh number So, ninth number = 0.75 ร— x = 0.75x So, x + 0.75x + x = 528 Or, 2.75x = 528 Or, x = 192

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