What's the simplified expression?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

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?

Meee i honestly dont know what this question talking about