Can someone explain this to me

40+15+(5n+5)=180
60+5n=180
5n=120
n=24

Ithink it’s b, hope this .

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.