SOLUTION: A student answers 75% of the questions on a math exam correctly. If he answers 15 questions correctly, how many questions are on the exam?

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Question 827662: A student answers 75% of the questions on a math exam correctly. If he answers 15 questions correctly, how many questions are on the exam?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.75x=15
3x/4=15
3x=60
x=20