Question
Sum of ages of 100 people is 2540 years. The average
age of 40 of them is 20 years and the average age of another 30 of them is 15 years. Find the average age of the remaining people.Solution
Given, sum of age of 100 people = 2540 years
Sum of age of 40 people = 40 × 20 = 800 years
Sum of age of another 30 people = 30 × 15 = 450 years
Remaining number of people = 100 – 40 – 30 = 30
Average age of remaining 30 people = {(2540 – 800 – 450)/30} = (1290/30) = 43 years
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