This should probably be a 6 or 7 kyu problem. An experienced dev can solve this in <1 minute without having seen the problem before. Hell, I'm not experienced and I solved it in <1 minute.

All tests pass for me other than the final "basic test", which throws this error: 'It must return 90 - Expected: 90, instead got: 2'. It is unclear to me which condition is not being satisfied here. If I could see the argument for this test, it would certainly help. Please note that I have read the question and comments above to which I am replying. Unfortunately, I do not understand how the response to this question was helpful in identifying why the test does not pass. Can anyone please explain smile67's response a bit further? Any help here would be much appreciated.

Did you figure out a way to proceed with this kata?