Answer:
3/2 cups of food
Step-by-step explanation:
3/4 cups        40%  (This was given in the question)
6/4 cups        80%  (Then double the amount. 3/4 x 2 = 6/4 | 40 x 2 = 80)
3/2 cups        100% (Finally, add the remaining 20% to get to 100%. To do so add half of the amount you added earlier. 6/8 + 6/4 = 18/12 | 18/12 = 3/2)
