20-90 = -70
70
-70
65 + 65 + 65 + 90 + 90 + 90 + 90 + 50 + 50 + 50 + 50 + 50 + 50 + 20 + 20 + 20 + 20 + 20 + 20 + 20 = 995
90% of 20 = 0.90 x 20 = 18 Therefore, 90% of 20 as a fraction = 18/1
90 - 20% = 72
20 out of 90 as a percentage is about 22.22%.
-20
gcf(20, 30, 90) = 10
20*.90 = 18
18 dollars 90 * (20/100) = 90 * 0.2 = 18
90% of 20 questions = 90*20/100 questions = 1800/100 = 18 questions.