Kylie drank 35% of 400-ml container of water. eugenia drank 45% of a 350-ml. who drank more water? how do you know? i will have more questions i have a math packet due tomorrow and i don't know percents i listen but i just don't understand

In the question, there are two people with different percentage of drinking water from different quantities.
Taking the first case of Kylie we get that he drank 35% water of 400ml
Then
35% of 400 ml = (35/100) * 400 ml
                         = (35 * 4) ml
                         = 140 ml
So Kylie drank a total of 140 ml water.
Now taking the case of Eugenia we get that he drank 45% of 350 ml water.
Then
45% of 350 ml = (45/100) * 350
                         = 1575/10 ml
                         = 157.5 ml
So Eugenia drank 157.5 ml of water. Then we can conclude that Eugenia drank more water than Kylie.

Here is my answer, i'm sorry if you didn't understand my explanation