3
20
Three 15 = 100% 1.5 = 10% 3 = 20% as a miss is 100% - 80% = 20%
22
90 x 20% = 90 x 0.20 = 18 If you miss 18 questions out of 90, you will get an 80% on the test.
3
20
12
Three 15 = 100% 1.5 = 10% 3 = 20% as a miss is 100% - 80% = 20%
22
90 x 20% = 90 x 0.20 = 18 If you miss 18 questions out of 90, you will get an 80% on the test.
Provided that all the ones that you do not miss are correct, then 30% of 90 = 90*30/100 = 27.
To achieve a score of 70 on a test of 20 questions, you would need to answer 14 questions correctly (70% of 20). This means you can afford to miss 6 questions and still pass the test with a score of 70.
To get at least 64% you can miss at most 100 - 64 % = 36 % Percent means "out of 100" 36 % of 56 = 36/100 x 56 = 20.16 → Can miss 20 questions.
100%-80%=20%10*.2=2Therefore you missed 2 questions.
20
20