El promedio de 5 números es 40, si se eliminan dos números el promedio de los tres números restantes seria 36. ¿cuál es el promedio de los dos números que se eliminaron?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

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?