I figured that 450 first divided into thirds gave me 150. 150 +150=300 eggs for 150 quarts and the other ice cream used 150 to make 150 quarts with all eggs used. I had cream left over though. 1050 divided in half because both used 3 cups=525. Then divide by 3 cups cream to get 175 quarts, but we only have enough eggs to make 150 quart.