Do 15 with a maximum score of 85. The possible scores are 85, 84. No.86, 87, 88 and 89; Four numbers.

Do 14 and get 80 points at most. The possible scores are 80, 79 and 78. 865438 +0, 82, 83; Three numbers.

Do 13 and get 75 points at most. The possible scores are 75, 74, 73, 72. Nos. 76 and 77; Two numbers.

If you do 12, you will get 70 points at most, and the possible scores are 70, 69, 68, 67, 66; There is no 71; 1 number.

Do the right question 1 1, with a maximum score of 65, and the possible scores are 65, 64, 63, 62, 6 1, 60;

If you do 10, you will get 60 points at most, and the possible scores are 60, 59, 58, 57, 56, 55, 54;

Get 9 questions right with a maximum of 55 points, and the possible scores are 55, 54, 53, 52, 5 1, 50, 49, 48;

By analogy, scores can be linked.

If you do the right question, you will get 10 at most, and the possible scores are 10, 9, 8, 7, …, 1, 0,-1…,-6;

Between -6 and -90, there are 10 numbers that cannot be obtained.

So 97- 10 = 87.

So the answer is: 87.