Mother’s age today is thrice as her daughter’s. After 10 years it would be just double. How old is the daughter today ?

A 8 years

B 9 years

C 10 years

D 11 years

Correct Answer: Option C

Let the age of the daughter today be ‘x’ years.
Mother’s age today = 3x years
After 10 years, we have
3x + 10 = 2(x + 10)
x = 10 years.