AGE of Kishore, his wife, and their child 6 years ago was 38 yearsThe average age of Kishore's wife and their child 8 years ago was 32 yearsConcept used:Average = \({Sum \ of \ total \ OBSERVATIONS \over Total \ number \ of \ observations}\)Calculation:Sum of ages of all three members 6 years ago = 38 × 3⇒ 114 years∴ Sum of ages of all three at present = 114 + (6 × 3)⇒ 132 yearsAlso, from given dataSum of ages of Kishore's wife and child 8 years ago = 32 × 2⇒ 64 years∴ Sum of ages of wife and the child at present = 64 + (8 × 2)⇒ 80years∴ The present age of Kishore is 132 - 80 i.e 52 years