The answer is 2.5 cups of flour per 1 cup of water… 2.5:1
The Ratio of Flour to Water is 5:2
And the ratios continue as 10:4, 15:6, 20:8…
You can start to see the pattern since each time you turn these ratios to division problems you get 2.5 which is the unit ratio.. So you just simply divide 5/2 and get 2.5!