Question

13.
There are 180 multiple choice questions in a test. A candidate gets 4 marks for every
correct answer, and for every un-attempted or wrongly answered questions one mark is
deducted from the total score of correct answers. If a candidate scored 450 marks in the
test how many questions did he answer correctly?​

Answer 1

Answer:

x=126

Step-by-step explanation:

Let the number of correctly attempted questions be x

so, the number of unattempeted or wrong question = 180-x

total marks for correct attemptions = 4x

and total marks for unattempeted or wrong question = -1 (180-x)

= x - 180

as total marks = sum of attempted and unattempeted or wrong question = 180-x

450 = 4x + x - 180

450 = 5x -180

630 = 5x

126 = x

so, the number of correctly attempted question was 126.

Answer 2

Step-by-step explanation:

two equations are as follows

x+y=180

4x+(-1)y = 450

solve this to get your answer

explanation ---

let x be the no of correct option and y be the negative marking . there are 180 questions.

he scores 450 .that means he lost his Mark's somewhere. so 4x -y=450