You and your friend both bought some gum. Your friend spent three times as much as you did. Altogether you spent $4.80. How much did you each spend on gum?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?