Question

What is the present age of Alex if he is one- fourth the age of a his father and if the age of the father is doubled, it is 20 years less than 100 years?

Answer 1

take father's age as x

if it is doubled i.e 2x .we get the answer as 20 less than 100 which means 100-20=80

accordingly the equation will be 2x=80

x=40

given that ,

son is 1/4 th of his father

hence ,

son = 1/4×(x)

I.e, 1/4×40 =10

Hope it helps