Question

the age of father is 30 years more than sons age. Ten years hence, the father's age will become three times the son's age that time. What is sons present age​

Answer 1

answer : let the son's present age be x

then the fathers age will is ( x+30 ) years

fathers age after 10 years = ( x+40 ) years

sons age after 10 years = ( x+10) years

x+40 = x+30

x+40 = 3 (x+10)

x+40 = 3x + 30

3x-x = 40 - 30

2x = 10

x = 10/2 = 5

so the sons present age will be 5yrs