There are 150 multiple choice questions in a test. A candidate gets 5 marks for every correct answer, and for every un - attempted or wrongly answered questions two marks are deducted from the total score of correct answers. If a candidate scored 540 marks in the test how many questions did he answer correctly.
Answers
Answered by
3
Answer:
120 is the number of questions the candidate answered correctly.
Step-by-step explanation:
Given that no of questions= 150.
Let number of correct answer be X.
Let number of wrong answer be Y.
Therefore, X+Y =150.............. (1)
Or, X = 150-Y
5 marks is given for correct answer.
-2 marks is given for wrong or unattempted answer.
The candidate score 540 marks.
Therefore,
5X-2Y =540
5(150-Y) -2Y =540
750-5Y-2Y=540
7Y=750-540
7Y = 210
Y = (210/7) = 30.
Therefore, X = 150-30 = 120.
Number of correct question answer is 120.
Answered by
0
Answer: 120 questions
Step-by-step explanation:
Similar questions