Question 856048
Let Bob's father age be x then bob's age = x - 25 and his son's age = x-25 - 27
=> x- 52
Their ages sum =100
x+x-25+x-52 = 100
3x - 77 = 100
3x = 177
x = 59

Therefore bob's father age = 59
Bob's age = x-25 = 59 - 25 = 34
Bob's son age = x- 52 = 59 - 52 = 7