64 + 76 is 140, and 140 + 28 is 168. Divide that by 6 to get 28. If 28 is cups, then do 28/1 divided by 3/4. Dividing a fraction is basically multiplying its opposite. 28/1 times 4/3 is 112/3. Divide that to get 37 1/3. You can't have 1/3 of a 3/4 cup serving, so the answer should be 37.