Their present age is: 27-3-3=2 1 (years old);

Multiply the sum by the formula:

My sister's present age is: 2 1÷(2+ 1)=7 (years old);

My elder sister's present age is 7×2= 14 (years old).

A: Now the sisters are 14 years old and 7 years old respectively.

So the answer is: 14 years old, 7.