if there are 13 questions on a test then how many can she get wrong to get a 80

Question

if there are 13 questions on a test then how many can she get wrong to get a 80%

Answer 1

Let x be the number of right answers.

Wrong answers = 13 - x

 

x/13 = 0.8

x = 13*0.8 = 10.4

 

Wrong answers = 13 - 10.4 = 2.6 assuming you can get partial credit.

Otherwise, you can only get 2 wrong answers to score above 80.