Jackson picked apples for his family. he picked a total of 6 1/2 pounds. he took 2 3/4 pounds to his aunt and 1 5/8 to his mother. how many pound of apples were left to give to his grandmother ?

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?