Question 645458
Ria's mother age is four times of her age now
let ria is x & her mother is 4x
in 20 years the mother will be twice as old age of Ria
4x+20=2(x+20)=2x+40
or 4x-2x=40-20
or 2x=20
or x=10=ria's age
& her mother is 40 yrs
ans