Answer:
14 3/8 pounds
Step-by-step explanation:
Given
Total pounds donated = 50 pounds
Amount for dogs D = 17 3/4 pounds
Amount for puppy P = 17 7/8 pounds
Required
Amount of cat food C
Total = D + P + C
50 = 17 3/4 + 17 7/8 + C
50 = 71/4 + 143/8 + C
50 = (142+143)/8 + C
50 = 285/8 + C
C = 50 - 285/8
C = 400-285/8
C = 115/8
C = 14 3/8
Hence the pounds of cat food donated was 14 3/8 pounds