Chas used 3 1/4 cups more cranberry juice than grape juice to make a fruit drink. He planned to make a total of 9 1/4 cups of the drink. How much did Chas use of each juice?
Let x = cups of grape juice
x + x + 3 1/4 = 9 1/4
2x = 9 1/4 - 3 1/4
2x = 6
x = 3 cups