To paint a sunset, tran makes a shade of orange paint using 5 drops of red paint for every 8 drops of yellow paint. if tran uses 15 drops of red paint, how many drops of yellow paint would he need?

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?