Question 138

Average age of seven person in a group is 30 years, the average age of five persons of this group is 31 years. What is the average age of the other two persons in the group/

Solution

given that average age of 7 persons in the group is 30 years

sum of ages=7*30 = 210

Also given that the average age of 5 persons in the group is 31 years

so the sum of ages of 5 people= 31*5=155

to get the sum of ages of other two people, subtract 155 from 210

i.e; 55

so average of this is

55/2

=27.5

since the option is not given, answer is none of these

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