In an examination 4 marks are assigned for correct answer and 1 mark is deducted for wrong answer. However one student attempted all 60 questions and scored 130.Number of questions he attempted correct is?
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Step-by-step explanation :
Let's the number of questions correctly answered is X.
Then ; the number of questions whose answers are incorrect = 60-X
X*4 - (60-X)*1 =130
4X - 60 + X = 130
5X = 190
X = 190/5
X = 38
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