Mange's score on a test was 84%. the test had 25 problems on it. what percent of the problems did marge get wrong? how many problems did she get wrong and how many did she get right?

She got 21 questions right, so 84% right and 4 wrong so 16% wrong

100 ÷ 25 = 4
So, each question is worth 4 points.
100 - 84 = 16
16 ÷ 4 = 4 (questions)
So, she got 4 questions wrong
25 - 4 = 21
So, she got 21 questions wrong
To double check do this,
21 x 4 = 84%
100 - 84% = 16%
So, she got 16% of her questions wrong
In conclusion, "She got 4 question incorrect and 21 questions correct and 16% of her questions were incorrect".
Hope this helps! :D