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A student answers 70 ​% of the questions on a math exam correctly. If he answers 21 questions​ correctly, how many questions are on the​ exam?

A student answers 70 ​% of the questions on a math exam correctly. If he answers 21 questions​ correctly, how many questions are on the​ exam?
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A student answers 70 ​% of the questions on a math exam correctly. If he answers 21 questions​ correctly, how many questions are on the​ exam?

User Marmistrz
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7.8k points

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There are 30 questions in all
User Teshia
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