Answer:
6 cups are left
Explanation:
There are 16 cups in a gallon. They drank 5 glasses, each holding 2 cups (5*2 = 10)
(4*4) - (5*2)
16 - 10 = 6
(5*2) + x = 16
10 + x = 16
-10 -10
x = 6
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