Question

10 yr ago, the age of a father was thrice the age of his
son whereas, 10 yr later the son will be half the age of
the father. The difference between their present
ages is



can we solve this by Cramer's rule
if yes then plzz help me by solving it..
​

Answer 1

10 years ago,if the age of the son is x and the father is 3x.

In present ,the age of the son is x+ 10 and the age of the father is 3x + 10 .

10 years later,

the age of son is x+20 and the age of father is 3x+20.

according to the question ,the age of the Son will be half of the age of the father ,,,,,,,,

(x+20)=1/2(3x+20)

or, 2x+40=3x+20

or, x=20

In present, the age of the son=(x+10)=20+10=30

andthe age of the father=(3x+10)=60+10=70