Question

a pet store donated 50 lbs of food for adult dogs puppies and cats to an animal shelter. 19 3/4 pounds was adult dog food and 18 7/8 pounds was puppy food. how many pounds of cat food did pet store donate?

Answer 1

Where x is the amount of cat food
50 - (19 3/4 + 18 7/8) = x 
x = 50 - (19 6/8 + 18 7/8)
 x = 50 - 38 5/8
x = 11 3/8

so, 11 and 3/8 pounds of cat food were donated to the shelter