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In a test, for each correct answer 1 mar...

In a test, for each correct answer 1 mark is awarded and each wrong answer half a mark is deducted. The test has 70 questions. A candidate attempted all the questions in the test and scored 40 marks. How many question did he attempt wrongly ?

A

15

B

20

C

25

D

10

Text Solution

Verified by Experts

The correct Answer is:
b
Let the number of questions attempted wrongly by the candidate be w.
`:.` Number of questions be attempted correctly `= 70 -w`
`1 (70 -w) - (1)/(2) w = 40`
`70 - (3)/(2) w = 40`
`w = 20`
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