Current location - Training Enrollment Network - Mathematics courses - The school held a math contest with 20 questions. He got 5 points for doing a correct question, and deducted 3 points for not doing a question or doing a wrong one. Liu Hao scored 60 points. How much
The school held a math contest with 20 questions. He got 5 points for doing a correct question, and deducted 3 points for not doing a question or doing a wrong one. Liu Hao scored 60 points. How much
The school held a math contest with 20 questions. He got 5 points for doing a correct question, and deducted 3 points for not doing a question or doing a wrong one. Liu Hao scored 60 points. How much did he do right? 1. Assuming everything is correct, you will get 20×5= 100 points, so you will get 100-60=40 points; Answering a question correctly is 5+3=8 points more than answering a question incorrectly, that is to say, the wrong question is 40÷8=5, and then the right question is 20-5= 15.

20-(20×5 - 60)÷(5+3)

=20 - 40÷8

=20 - 5

= 15 (road)

2. Solution: Suppose he did the X problem correctly.

5x-3 (20x) =60

The solution is x= 15.

A: He got it right 15.