Answer:
10 cups of flour
Explanation:
Ratios tell you how much of one thing there are compared to another.
It is stated that the ratio of water to flour is 1:4.
This means for every 1 cup of water, there are 4 cups of flour.
If there are 2.5 cups of water, we do 2.5 x 4 = 10 cups of flour.