Madhya Pradesh Police Exam Model Paper 10

Given:
The average age of 2 sisters is 16 years. If the age of brothers is also included, the average age of 3 siblings will be 14 years.
Formula:
Average of n numbers a1, a2 ... an = (a1 + a2 + ... an)/n
Calculation:
The age of 2 sisters $=16\times 2=32$
Let the age of brother be x years
As per question,
$\left(32+\mathit{x}\right)/3=14$
$32+\mathit{x}=42$
x = 10 years
Hence, Brother’s age is 10 years