So 4 eggs is 2/3of 6 eggs, so to get the amount of milk we multiply the 3 cups by 2/3 (or just divide by 3 and multiply by 2) and get 2 cups of milk.
Hope this helps!
Both sides are symmetrical by the length and the shape
7/12*6/14
7*6=42
12*14=168
=42/168
=0.25 =1/4
