Dear student
Let the son's age be x.
Then, Meera's age will be 3x.
After 12 years
Son's age=x+12
Meera's age=3x+12
According to question,
3x+12=2(x+12)-1
3x+12=2x+24-1
3x-2x=23-12
x=11
So, Son's present age will be 11 years
and Meera's present age will be 33 years.
Regards