Get 10 for a correct answer, and deduct 3 points for a wrong answer. That is to say, a mistake and loss 10+3= 13 points. Full score 100.

Xiao Ming's correct answer number: 100-87= 13 (points)13 =1(road) 10- 1=9 (.

Number of Xiaohong's correct answers: 100-74=26 (minutes) 26/ 13=2 (lanes) 10-2=8 lanes.

Xiaohua's correct number of questions: 100-9=9 1 (minutes) 9113 = 7 lanes 10-7=3 lanes.

This is correct, please adopt it. If you don't understand, please ask.