The steps to solve the problem are as follows:

The total score is 20×5= 100 (points)

But I don't know Xiaoying's score, and I hope to add it in the question. Or ask me.

Forget it, I'll tell you what to do.

Subtract Xiaoying's score from the total score 100 to get a number Xiaoying didn't get. Divide Xiaoying's score by the sum of 5+2 to get Xiaoying's wrong number, and then subtract Xiaoying's wrong number from 20, which means Xiaoying * * * has done several questions right.