The average age of six brothers is 15 years. If their father is also included, the average is increased by 7 years. Find the age of the father (in years).
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 64 years.
Given:
The average age of six brothers is 15 years
Formula:
Average = Sum of observations/Total number of observations
Calculations:
Sum of the age of six brothers = 6 × 15 = 90
When father is included, average age becomes = 22
Sum of the age of six brothers and father = 22 × 7 = 154
Age of father = 154 - 90 = 64