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SSC MTS 2018 · PYQ · Average · medium

The average of four numbers is 20. If the average of the first two numbers is 15, then what is the average of the last two numbers?

  1. A.22
  2. B.20
  3. C.18
  4. D.25✓ Correct

Explanation

Sum of all 4 numbers = 80. Sum of first two = 30. Sum of last two = 80−30 = 50. Average of last two = 50/2 = 25.
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