In order to get an A, she needed to answer at least 90 percent of the
questions correctly. How many questions would she have needed to
answer correctly to get an A?
18 questions In order to get an A on the exam, Alyssa needs a ratio of 90 : 100. Looking at the solutions in part (a), 100 is 5 times 20 so to see how many questions Alyssa needs to answer correctly out of 20 we can divide 90 by 5. Since 90 \div 5 = 18, Alyssa needs to answer 18 questions correctly.
