In a test, +2 marks are given for a correct answer and -1 mark for an incorrect answer. Pavani scored 30 marks in the test and she had got 18 correct answers. How many of Pavani's answers were incorrect?
Given: In a test, +2 marks are given for a correct answer and -1 mark for an incorrect answer
Pavani scored 30 marks in the test and she had got 18 correct answers
To find: How many of Pavani's answers were incorrect
Answer
Correct answer = $+$2 marks
Incorrect answer = $-$1 marks
Pavani scored 30 marks
Number of correct questions by Pavani = 18
Let the number of incorrect questions by Pavani = $y$
Score of Pavani = $18 \times 2 + y x - 1 = 30$
$36 - y = 30$ or $y = 36 - 30 = 6$; $ y = 6$
The number of incorrect questions by Pavani = 6
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