Question

The average age of 5 members of a family is 25 year if the servant of the family is included the average age increases by 40 percent .what is the age of servant

Answer 1

average age of 5 members of a family = 25

so sum of age of all members = 25 × 5

= 125

now if we add servent

average age increases by 40 %

old average = 25

so new average = 25 + 40 % of 25

= 25 + 10

= 35


so now if average of 6 members = 35

then sum of their ages = 35 × 6

= 210

so , servents age = sum of ages of 6 members -sum of ages of five members

= 210 - 125

= 85 years