In a test, +2 marks are given for each correct answer and ( - 1 ) for each wrong answer. A student has scored 21. If he has attempted total of 12 correct questions. How many questions has he attempted incorrectly ?
[4 MARKS]

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Solution

VIsualizing the Question : 1 Mark
Steps : 2 Marks
Result : 1 Mark

Marks given for each correct answer = +2

Marks given for each wrong answer = ( -1 )

Marks obtained by 12 correct questions = 12 × 2 = 24

Marks obtained by student = 21

So, total negative marks = 24 - 21 = 3

So, he has attempted 3 questions incorrectly.

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Q. In a test, +2 marks are given for each correct answer and ( - 1 ) for each wrong answer. A student scored 21 and answered 12 questions correctly. How many questions did he answer incorrect? How many questions did he attempt in total? [4 MARKS]

In a class test $(+ 3)$ marks are given for every correct answer and $(- 2)$ marks are given for every incorrect answer and no marks for not attempting any question.
(i) Radhika scored $20$ marks. If she has got $12$ correct answers, how many questions has she attempted incorrectly?
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(iii) Rakesh scores $18$ marks by attempting $16$ questions. How many questions has he attempted correctly and how many has he attempted incorrectly?