Help please I really need help

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.