Question 31933
Her sister's age = x
Her age = x-9
2 years ago her sister's age = x-2
2 years ago her age = x-9-2-->x-11
EQuation:
2(x-11)=x-2
2x-22=x-2
x=20
20-9=11

Hence, Gina's age is 11 and her sister's age is 20.
Paul.