Question

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 and incorrectly
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Answer 1

click on the photo u will get step by step explanation

correct answers-126

no. of wrong questions is 54

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Answer 2

Answer:

be x.

Let the wrongly answered questions be y.

Then,according to the question,

x+y=180 and 4x−y=450

Adding these two equations,

x+y+4x−y=450+180

5x=630

x=126

From the above equation,

126+y=180

y=54

Therefore, 126 questions are answered correctly