There are 20 questions in the math paper, and if you answer one correctly, you will get 5 points; Doing a wrong question will get 2 points, not 0 points.

Suppose we do the right X, the wrong Y, and don't do (20-x-y).

5x-2y=64

X>0, y>0 and are all integers.

X= 14，y=3。

A: Xiao Ming did the right 14 question, wrong 3 questions and didn't do 3 questions.