Question

a recipe calls for 1/2 cup of sugar and 3/4 cup of flour. if you have 3 cups of flour and you want to adjust the recipe so you use it all how much sugar do you need?

Answer 1

well lets see,
3/4 cups plus another 3/4 cups totals 1 1/5 cups. double that to make it 3 cups would mean you took the original 3/4 and times it by 4
meaning you would have to take the sugar and times that by 4 as well leaving you with 3 cups of flour and 2 cups of sugar!
hopes this helps