There must be fewer than 20 students in each class.

In order to watch the movie, participants must be over 20 years old.

Raul has at least 20 friends in his neighborhood.

Mrs. Stephens assigns at most 20 problems for homework every night.

Kayla can download no more than 20 songs in a week.

In order for a swimming class to be held, there must be a minimum of 20 students.