Question

Bobby-Joe takes a 25-question test for which he receives 4 points for each correct answer and loses 1 point for each wrong answer. If Bobby-Joe answers all the questions and gets a passing grade of 65%, how many questions did he get right?

Answer 1

Answer:

Let x be the number of questions he gets right. Let y be the number of questions he gets wrong.

Then:

x + y = 25

4x - 1y = 65

Adding these two equations gives:

5x = 90

x = 90/5 = 18 right answers

y = 25 - 18 = 7 wrong answers

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Answer 2

The number of right questions is 18

How to determine the right question?

Let the number of right questions be x, and the wrong questions be y

So, we have the following equations

x + y = 25

4x - y = 65

Add both equations

5x =90

Divide both sides by 5

x = 18

Hence, the number of right questions is 18

Read more about system of linear equations at:

https://brainly.com/question/13729904