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A student answers 90% of the questions on a math exam correctly. If he answers 18 questions correctly, how many questions are on the exam?

A student answers 90% of the questions on a math exam correctly. If he answers 18 questions correctly, how many questions are on the exam?
asked 132k views
4 votes
A student answers 90% of the questions on a math exam correctly. If he answers 18 questions correctly, how many questions are on the exam?

asked
User Michalina
by
8.2k points

2 Answers

2 votes
There are 20 questions.

answered
User Bill Criswell
by
8.1k points
5 votes

x=total questions on quiz

90/100=18/x

1800=90x

x=20

There were 20 questions on the quiz.

answered
User Ckramer
by
7.5k points
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