Question
Sum of ages of 80 people is 1600 years. The average age
of 30 of them is 18 years and average age of another 30 of them is 14 years. Find the average age of each of the remaining people.Solution
Given, sum of age of 80 people = 1600 years
Sum of age of 30 people = 30 × 18 = 540 years
Sum of age of another 30 people = 30 × 14 = 420 years
Remaining number of people = 80 – 30 – 30 = 20
Average age of remaining 20 people = {(1600 – 540 – 420)/20} = (640/20) = 32 years
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