Erika drinks at least 40 ounces of water a day

 40 ounces or 0.3125 of a gallon

i didnt quite understand what you were asking but here is it broken down. :)

linear

step-by-step explanation:

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.