Answer:
They are all correct. Well done.
So first you have to do 18 multiply by 2/9. This gets you 4, next you multiply by 1/2. This gets you 2.
ANSWER: She will have 2 stamps left.
Wouldn't it be -1 (minus one)? 12 - 1 = 11 and 9 - 1 = 8.
Is it 57? ...............................