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      Question

      The average of twenty numbers is 40 while the average of

      first ten numbers and last ten numbers is 48 and 56, respectively. Find the tenth term.
      A 200 Correct Answer Incorrect Answer
      B 120 Correct Answer Incorrect Answer
      C 240 Correct Answer Incorrect Answer
      D 285 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Sum of twenty numbers = (20 Γ— 40) = 800

      Sum of the first ten numbers = (10 Γ— 48) = 480

      Sum of the last ten numbers = (10 Γ— 56) = 560

      So, tenth term = 480 + 560 - 800 = 240

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