Amy got the first 3 wrong, and the others corrct.
If Scott got the last onewrong and the 26 before that and then another one wrong, that means he got two wrong.
Amy got the first 3 wrong, which means the one Scott got wrong was one of the ones Amy got wrong.
So, Amy's best percentage is 27/30, since the best is if Amy and Scott both get the first one wrong.
27/30=9/10=90%
so 90%