Arithmetic Aptitude Average

• A 10.5
• B 12.45
• C 11.24
• D 9.5
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A

Answer: A

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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