30
20
The answer depends on whether or not there are penalties (negative marks) for wrong answers. If not, then the answer is 30.
6 wrong means 14 correct. 14/20 * 100% is 70%.
70% score implies 30% wrong. 30% of 160 = 160*30/100 = 48
You need to get 40*60/100 = 24 correct, so you can get 40-24 = 16 wrong.
20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
In order to score an 80 percent on a 70 question test, one can afford approximately 14 errors. This question can be calculated by taking 56 divided by 70,which equals 0.8. Take 0.8 and multiply that by 100 to get 80.
(2/30)*100 =6.666666666666667% wrong
100 questions = 20% so 1 question = 20/100 = 0.2%
20 questions = 100% 19.2 questions = 96% its impossible to get 96% on a 20 question test. If you don't get 100%, then the best you can get is 95%.
28/38 * 100% = 73.68% You got about 74% on the test.