In a test , one mark is awarded for each correct a swer and 0.5 is deducted for each incorrect answer. A student attempted all questions in it. If the marks awarded for each correct answer and marks deducted for each incorrected answer are interchanged, then he would have got 90 marks less than what he would have actually got. Find the number of questions in the test.
Answers
Answered by
2
Answer:tgyyyyyyyyyyyyyyyy
Step-by-step explanation:
Answered by
6
Answer:
180
Step-by-step explanation:
Let x be the number of correct answer and y be the
incorrect answers.
Marks obtained = (x ∗ 1) – (y ∗ 0.5)
= x – 0.5y
On interchanging
Mark obtained = 0.5x – y
(x – 0.5y) – (0.5x – y) = 90
0.5x +0.5y = 90
x + y =
90
0.5
= 180
[wrong answer in key]
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