SOLUTION: Mark had 14 problems wrong on his test. His score was 72% correct. How many problems were on the test?

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Question 1006403: Mark had 14 problems wrong on his test. His score was 72% correct. How many problems were on the test?
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
100% - 72% correct = 28% wrong.

14 wrong is equal to 28%.

x is the number of problem on the test.

.28 * x = 14

divide both sides of this equation by .28 to get x = 14/.28 = 50

there are 50 problems on the test.

14 / 50 = .28 * 100 = 28%.

100% - 28% = 72%

28% wrong
72% right