Denzil earned money after school. he put 1/2 of this month s earnings into savings. he took the rest to spend at the amusement park. he spent 1/5 of this amount on popcorn and 3/4 of it on rides. what fraction of his earnings did he take to the park but not spent on rides or popcorn.

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?