The average of 20 numbers is 12 The average of the…

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The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 numbers is 10. The last number is ?

  1. A. 40
  2. B. 38
  3. C. 48
  4. D. 50

Answer: Option B

Here is complete explanation of The average of 20 numbers is 12 The average of the….

Solution(By ExamCraze Team)

Let the last number = x
According to the question,
⇒ 12 × 11 + 7 × 10 + x = 20 × 12
⇒ 132 + 70 + x = 240
⇒ x = 240 - 202
⇒ x = 38

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