14.1k views
5 votes
Deanna gets 3 problems incorrect on her quiz. Her score is 85%. How many questions are on the quiz?

2 Answers

3 votes

Answer:

20 questions

Explanation:

Deanna got 15% incorrect

The 15% is equal to the 3 questions she got wrong

Divide 15 by 3 to get 5

Then, divide 100% by 5 to get 20

Therefore, there are 20 questions of the test

User Spulec
by
8.2k points
4 votes

Let's start by seeing what percentage is incorrect.

100-85=15

So, 15% is incorrect when answering 3 problems wrong. So let's divide 15 by 3.

15÷3=5

So, each problem is worth 5%, let's divide 100 by 5. The reason I'm doing this is to find out how many questions are on the quiz since if you got them all right, it's 100.

100÷5

20

There are 20 questions, let's make sure this is correct.

If she got 3 wrong, she got 17 right. Let's calculate her percentage and make sure it is the right one.

17÷20

.85×100

85%

Answer: So, there are 20 questions on the math quiz.

User Juancazalla
by
8.5k points
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