3. The kitten participated in the math contest, and got 67 points for doing 20 questions, 5 points for doing it right, 0 points for not doing it, and 1 point for doing it wrong. You should know that he did as many wrong questions as he didn't. Please ask the kitten to do a few questions correctly.

This problem can be set as that the kitten did the right X direction, then did the wrong (20-X)÷2, and didn't do the wrong (20-X)÷2, and then subtracted the wrong multiplication 1 as the multiplication of the pair, which is equal to 67.

Equation:

5x-(20-x) ÷ 2x1= 67x = 14 The kitten did it right14.