The average age of seven persons in a group is 30 years. The average age of five person of this group is 32 years. What is the average age of the other two persons in the group?
The average age of seven persons in a group is 30 years. The average age of five person of this group is 32 years. What is the average age of the other two persons in the group?
Explanation
Average age of 7 persons = 30years
Sum of age of persons = 30×7 = 210 years
Average age of 5 persons = 32 years.
Sum of ages of 5 persons 32×5 = 160 years
∴ Sum of age of remaining two persons = 210 - 160 = 50years
∴ Average of remaining two is = 50/2= 25years
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ND17-1-2023