setting up ratio problems

Question

a recipe calls for 1 2/3 cups of flour and 2 1/6 cups of sugar. What is the ratio of flour to sugar?

Answer 1

1 2/3 = 5/3 = 10/6

2 1/6 = 13/6

ratio of 1 2/3 to 2 1/6 = 10/6 to 13/6 = 10/13