Current location - Training Enrollment Network - Mathematics courses - There are 20 questions in a math contest, and one question is answered correctly. If you do, you will get a very correct answer. How many questions are answered incorrectly in zero?
There are 20 questions in a math contest, and one question is answered correctly. If you do, you will get a very correct answer. How many questions are answered incorrectly in zero?
Comprehensive knowledge grabs the answer, a correct answer adds ten points, and a wrong answer deducts four points.

1, a student * * * answered ten questions and finally got 72 points. He answered several questions correctly.

10-( 10× 10-72)÷( 10+4)

= 10-28÷ 14

= 10-2

=8 questions

2. Student B * * answered twelve questions and finally got 22 points. He answered several questions wrong.

( 10× 12-22)÷( 10+4)

=98÷ 14

=7 questions