math
posted by Marie .
the pet shop owner told Jean to fill her new fish tank 3/4 full with water. Jean filled it 9/12 full. What fraction of the tank does Jean still need to fill??

3/4 = 9/12

9/12 = 3/4 * 3/3
3/3 = 1
SAme fraction, no more water. 
9/12 because it is the same fraction.

none

3/3

9/12

Im smart so 0/12 because 9/12=3/4

Rename 9/12 and 3/4 then subtract so you get an answer.