Question

In a class test, (2) marks are given for every correct answers and (-1) marks for every
incorrect answers and no marks for not attending any questions.
Sreya scored 30 marks. If she got 16 correct answers, how many questions has she attempted
incorrectly?

Answer 1

Using a system of equations, it is found that she attempted two questions incorrectly.

What is a system of equations?

A system of equations is when two or more variables are related, and equations are built to find the values of each variable.

In this question, the variables are:

• Variable x: Number of questions attempted correctly.

• Variable y: Number of questions attempted incorrectly.

Sreya scored 30 marks, with 16 correct questions, hence, considering the amount of points for each question, we have that:

2x - y = 30.

Since x = 16:

32 - y = 30

y = 2.

She attempted two questions incorrectly.

More can be learned about a system of equations at https://brainly.com/question/24372153

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