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QIn a class, the average age of 15 boys is 11. If 5 boys each of age 9 years are added, what will be the new average?

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#4598Q ID
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  • A 10.5 ✔ ✖
  • B 12.45 ✔ ✖
  • C 11.24 ✔ ✖
  • D 9.5 ✔ ✖
Correct Answer: Option A

Explanation

The new average will be 10.5 years.
To find this, we can use the following steps:
The sum of the ages of the 15 boys is 165.
The sum of the ages of the 5 boys is 45.
The total age of the 20 boys is 165 + 45 = 210.
The total number of boys is 20.
Therefore, the average of the ages of the 20 boys is 210 / 20 = 10.5 years.

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