Arecipe has a ratio of 2 cups of sugar to 6 cups of flour. how many cups of flour are used for each cup of sugar in the recipe?

The ratio 2 to 6 can be reduced to 1 to 3. That means for every 3 cups of flour there is one cup of sugar. 

2 : 6                  /2
1 : 3

There are 3 cups of flour for each cup of sugar.

"Non nobis Domine, non nobis, sed Nomini tuo da gloriam."

Regards M.Y.