Question

present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Answer 1

Answer:

Let the present ages of man and son be x and y respectively

x+y = 45  

5 yrs ago , age of man = (x-5)

age of son = (y-5)  

(x-5)(y-5) = 4(x-5)

(y-5) = [4(x-5)] / (x-5)

y-5 = 4. [(x-5) got cancelled out]

y = 9 yrs  

x+y = 45 yrs  

x+9 = 45  

x = 45-9 yrs => 36 yrs