Find the values of x and y with the containing numbers of 8y, 40, and 40. Please help, thanks! I figured out 5 for y, but I can’t seem to get x.

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3