Final answer:
To determine how much more liquid Susan needs to pour, subtract the amount she has already poured (107.2 mL) from the total amount she wants to pour (300 mL). The answer is 192.8 mL.
Step-by-step explanation:
The problem presented is a straightforward subtraction problem in the subject of Mathematics. Susan wants to pour a total of 300 milliliters of a liquid. But she has already poured 107.2 milliliters.
So, to find out how much more she needs to pour, we subtract the amount she has already poured from the total she wants to pour. So, 300 milliliters - 107.2 milliliters = 192.8 milliliters.
Therefore, Susan needs to pour an additional 192.8 milliliters of the liquid.
Learn more about Subtraction