Answer:
89 milliliters liquid was in the container before George added more .
Step-by-step explanation:
Let us assume that the liquid was in the container before George added more be x .
As given
George's container was partially full.
Then he added 177 milliliters more liquid to the container.
Now the container has a total of 266 milliliters of liquid.
Than the equation becomes
liquid was in the container before George added more + liquid added = Total liquid in the container
Putting all the values in the above
x + 177 = 266
x = 266 - 177
x = 89 milliliters
Therefore 89 milliliters liquid was in the container before George added more .