Two students went shopping this weekend at a local thrift store. They purchased some dresses, some purses,
and some hats. In total they purchased 9 items for a total of $60. They purchased two times as many purses
as they did hats. If dresses cost $12 each, purses cost $5 each, and hats costs $2 each, how many dresses,
purses, and hats were purchased?