The average age of 20 boys in a class is 12…

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The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of all the boys in the class becomes:

  1. A. 8.2 years
  2. B. 9.5 years
  3. C. 12.5 years
  4. D. 11 years

Answer: Option D

Here is complete explanation of The average age of 20 boys in a class is 12….

Solution(By ExamCraze Team)

According to the question,
Average
= $$frac{20 × 12 + 5 × 7}{25}$$
= $$frac{240 + 35}{25}$$
= $$frac{275}{25}$$
= 11 years

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