Question

Sum of present age of salim and his father is 70 years .5 years ago,father's age was 5 times the age of salim.Find their present ages

Answer 1

s+f=70

5(s-5)=(f-5)

5s-25=f-5

5s-f=20

s+f=70

6s=90

s=15years

f=55years