90% of 21 = 18.9
So, in order to score 90% on a test with 21 questions,
you can't miss more than two of them.
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You can get 5 out of 50 questions wrong to get 90%.
90% of 20 questions = 90*20/100 questions = 1800/100 = 18 questions.
90%-74% = 16%
0.900 percent = 0.90 percent = 0.9 percent = 9/10 percent 0.900 percent = 0.009 0.900 = 90 percent
90 minus 30 percent - and therefore 30 percent OFF the number, is equal to 90 x (1 - (30 / 100)) = 90 x (1 - 0.3) = 90 x 0.7 = 63. 30 percent OF 90 is equal to 90 x (30 / 100) = 90 x 0.3 = 27