Question

average age of family of a five members today is 36.after 3 years a person aged 75 dies and the girl is born in the same year.what is the average age of the family 5 years from today​

Answer 1

Answer:

Average age  = 16 years

Step-by-step explanation:

Condition 1 :

average age today is

(x+y+z+a+b)/5 = 36

x+y+z+a+b = 36*5 = 180

Condition 2

after 3 years each persons age rises by 3 i.e. 5*3 =15

x+y+z+a+b+15 = 180

x+y+z+a+b = 165

Condition 3

a person of age 75 dies and a girl of age 0 is born

x+y+z+a+b = 165-75 = 90

(x+y+z+a+b) = 90

therefore average age of the family after 5 years (from today as age of each person is increased by more 2 years then 2*5=10 which is subtracted from the total)

(x+y+z+a+b)/5 = 80/5

=16 years