4. In a class test of Science, (+3) marks are given for every correct answer and (-2) marks are given for every
wrong answer and no marks for not attempting the question. Rahul scores 20 marks. If he has got 10
correct answer, how many questions has he attempted wrongly?
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2
Step-by-step explanation:
correct answer = 10=3*10=30
30-x*(-2)=20
-x*(-2)=-10
2x=-10
x=5
therefore incorrect answers are 5
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