A student answers 80% of the questions on the math exam correctly, if she answers 40 questions correctly. How many questions are
on the exam?
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1 answer:
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Since a negative times a positive makes a negative you can change your equation to 7 - 5n=42. You can now subtract 7 from both sides to get -5n = 35. Next get divide -5 on both sides giving you n = -7.