The total weight of the fish in a tank of tropical fish at Fish ‘n’ Fur was \(\cfrac{7}{8}\) lb. Each fish weighed \(\cfrac{1}{64}\) lb. After Eric bought some fish, the total weight of the fish remaining in the tank was \(\cfrac{1}{2}\) lb. How many fish did Eric buy?

Fish ‘n’ Fur had a bin containing \(2\cfrac{1}{2}\) lb of gerbil food. After selling bags of gerbil food that each held \(\cfrac{3}{4}\) lb, \(\cfrac{1}{4}\) lb of food was left in the bin. If each bag of gerbil food sold for $3.25, how much did the store earn?

Describe Niko bought 2 lb of dog treats. He gave his dog \(\cfrac{3}{5}\) lb of treats one week and \(\cfrac{7}{10}\) lb of treats the next week. Describe how Niko can find how much is left.

There were \(14\cfrac{1}{4}\) cups of apple juice in a container. Each day, Elise drank \(1\cfrac{1}{2}\) cups of apple juice. Today, there is \(\cfrac{3}{4}\) cup of apple juice left. Derek said that Elise drank apple juice on nine days. Do you agree with Derek? Use words and numbers to explain your answer.