To solve the problem, we need to use proportions. The recipe requires 3 parts of milk and 4 parts of flour. This means that for every 3 cups of milk, we need 4 cups of flour. If we have 5 cups of milk, we can set up a proportion:
3/5 = 4/x
where x is the number of cups of flour needed.
We can solve for x by cross-multiplying:
3x = 20
x = 20/3
x ≈ 6.67
Therefore, we need approximately 6 2/3 cups of flour, which is answer (J).