Homeroom 101 and homeroom 102 share a hallway bulletin board. if homeroom 101 uses 3/5 of their half to display artwork, what fraction of the bulletin board is used to display homeroom 101's artwork?

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.