SBI Clerk Mains Written Test Qs.(Quantitative Aptitude) :: Average - Discussion

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Explanation:
let, present age of A and B and C is x and y and z.
before 3 yrs ago sum of their age was (x-3)+(y-3)=2*18
x+y=42..........(1) and
now sum of their age is x+y+z=22*3
x+y+z=66..........(2)
solving eqn (1) and (2), we get z=24