Question

five years hence the age of jacob will be 3 times that of his son . five years ago jacoba's age was seven times that of his son . what are there present age.

Answer 1

let Jacob age be x
his son age be y
then
after 5 year
Jacob age=x+5
his son age=y+5
now
given
x+5=3(y+5).......1

Five years ago
Jacob age = x-5
his son age=y-5
given
x-5=7(y-5).........2
solve these two equation 1 and 2 to get x and y

y (son age)=10
x(Jacob age)=40

Answer 2

that is it hope u can understand well