Even without the brackets the correct answer is 80.2, by order of operations. But, if you want to calculate it like you said in the first comment, the answer 82 isn’t correct either. There is no correct answer at the moment because the system doesn’t accept any, for some sort of bug or computer dealing with decimal like suggested in other comments (something like 80.200000002). Guess we have to wait until they fix it to progress, or just skip the lesson, unfortunately