Answer:
We need 2 fluid ounces of the liquid.
Explanation:
We have that,
Ratio for the cups and the water = 2 cups : 1 gallon.
It is required to find the number of cups to be added in 1 pint of lemonade.
Since, we know,
1 cup = 8 ounces i.e. 2 cups = 16 ounces
1 pint = 16 ounces
1 gallon = 128 ounces
Thus, we have the relation between ratio of the cups and the liquid as,

i.e.

i.e.

i.e. x = 2
Thus, we need 2 fluid ounces of the liquid.