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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:
Answer & Solution
Correct Answer:
Option
D
According to the question,
Average
= $$\frac{20 × 12 + 5 × 7}{25}$$
= $$\frac{240 + 35}{25}$$
= $$\frac{275}{25}$$
= 11 years
Average
= $$\frac{20 × 12 + 5 × 7}{25}$$
= $$\frac{240 + 35}{25}$$
= $$\frac{275}{25}$$
= 11 years
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