Question

Derek's score on a test was 90 percent. He had 72 questions right. How many problems were on the test?

Answer 1

90% = 72 questions

\\Find 1%

1 % = 72 ÷ 90 = 0.8

\\Find 100%

100% = 0.8 x 100 = 80 questions

Answer: There were 80 questions