Question

A recipe calls for 6 cups of water and 4 cups of flour. If the recipe is increased to use 6 cups of flour, how much water should be used? Set up a proportion and solve.

Answer 1

Alright, so the hard part here is probably setting up the proportion. Well, the first proportion is 6 cups of water to 4 cups of flour, which will look like this: 
$\frac{6 cups H2O}{4 cups flour}$. 

Now you'll have to set up the second proportion, since you're gonna use 6 cups of flour. So the second proportion will look like this: $\frac{x cups H2O}{6 cups flour}$. x is the number you'll be solving for. 

Set the two proportions equal to each other and solve for x. Good luck!