Question

A multiple-choice test consist of 100 questions. A correct answer is worth two marks, while an incorrect answer is worth -1 marks, if a student receives a score of 80, how many questions of the student answer incorrectly

Answer 1

40

Explanation:

if each question correct is worth two points, then the total points is 200. multiply the actual score by two to make the wrong answers equal the right answers, and then subtract it from 200. it should come out to look like
`80*2=160\\200-160=40`