The school held a math contest with 60 questions. It is stipulated that if a question is done correctly, 3 points will be deducted, and if a question is not done wrong, 2 points will be deducted. Xiaojie scored 160. How many questions did he answer correctly? Solution: If you did the right question X, then you did the wrong question 60-x,

According to the meaning of the question, 3x-2 (60-x) =160;

Solution, x=56

Arithmetic solution:

Assuming that you are right, you should get 3×60= 180, which is more than the actual score 180- 160=20. The right 1 question is 3+2=5 points less than the wrong 1 question, so the wrong one is 20 ÷ 5 =

Comprehensive formula: Correct (160+2×60)÷(3+2)=56 questions.