infosys - father says my son is five times older than my daughter my wife is 5 times older that my son i am twice old from my wife and altogether is equal to my mother s age and she is celebrating her 81 birthday so what is my sons age - skillgun

Assume Here Daughter's Age is x ,Son's age is 5x and Mother 's Age is 25 x, Father age is =50 x.So After all their sum of Age is equal to his mother's age i.e 81.So x+5x+25x+50x=81x=>x=1 Therefore Son's Age is 5