Answer:
3.2 cups.
Explanation:
There are 16 cups in one gallon.
16 ÷ 10 = 1.6
Are 1.6 cups in 1/10 of a gallon. If the bottle is half full, that means we need to double this number(basically adding the two haves) to get the whole.
1.6 x 2 = 3.2
There is your answer. Let me know if you need anymore help!