A gym is 21 years newer than the auditorium. The gym is also one fourth as old as the auditorium. How old is each building?

Choices for auditoriums age:26, 27, 28

1 answer

gymage +21=audage
gymage=audage/4

audage/4+21=audage
21=3/4 aud age
aud age=you do it.