Question

3 years ago the average of A and B was 20 years, now C has joined and the average became 25 years, then what is the present age of C​

Answer 1

Answer:

Let the present ages ofA,B and C be x years,y years and z years respectively.

Given,

2 (x−3)+(y−3)

=18⇒x+y−6=36⇒x+y=42 and 3 x+y+z

=22

⇒x+y+z=66⇒42+z=66⇒z=24 years.