Correct Answer - Option 3 : 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 × 2 = 32
Let the age of brother be x years
As per question,
(32 + x)/3 = 14
32 + x = 42
x = 10 years
Hence, Brother’s age is 10 years
