Question

The average of the ages of a group of 65 men is 32 years. If 5 men join the group, the average of the ages of 70 men is 34 years. Then the average of the ages of those 5 men joined later (in years) is:

• A. 60
• B. 65
• C. 55
• D. 50

Answer 1

Answer:

A. 60

Solution: Given: The average age of 65 men = 32 years Number of new men added = 5 The average ages of 70 men = 34 years Formula Used: Average = Sum of the observation/Total number of observation Calculation: Sum of the age of men = Average × Total number of men Sum of the age of 65 men = 32 × 65 = 2080 Sum of the age of 70 men = 70 × 34 = 2380 Sum of the age of 5 men = Sum of the age of 70 men - Sum of the age of 65 men Sum of the age of 5 men = 2380 - 2080 = 300 Average of 5 men added newly = 300/5 = 60 ∴ The average of the ages of those 5 men joined later is 60