Which sentence below represents the number of test questions in the problem below?

a test is worth 80 points. multiple-choice questions are worth 2 points, and short-answer questions are worth 4 points. if the test has 25 questions, how many multiple choice questions are there?

a. the number of multiple-choice questions plus the number of short-answer questions is 25.
b. the number of multiple-choice questions times the number of short-answer questions is 25.
c. the number of multiple-choice questions minus the number of short-answer questions is 80.
d. the number of multiple-choice questions plus the number of short-answer questions is 80.

there are 10 multiple choice questions and 15 short-answer questions

Step-by-step explanation:

Let x represent the number of multiple choice questions in the test.

Let y represent the number of short-answer questions in the test.

If the test has 25 questions, it means that

x + y = 25

Multiple-choice questions are worth 2 points, and short-answer questions are worth 4 points. The test is worth a total of 80 points. It means that

2x + 4y = 80 - - - - - - - -1

Substituting x = 25 - y into equation 1, it becomes

2(25 - y) + 4y = 80

50 - 2y + 4y = 80

- 2y + 4y = 80 - 50

2y = 30

y = 30/2 = 15

x = 25 - y = 25 - 15 = 10

A. The number of multiple-choice questions plus the number of short-answer questions is 25.