Question

In a competitive examination, 3 marks are given for every right answer and 2 marks are deducted for every wrong answer. a student attempts 30 questions and obtains 40 marks.how many questions did he answered correctly?

Answer 1

20
3x-2y=40
x+y=30
After solving it x=20
y=10

Answer 2

he do correct = 20 questions
I.e. 20 ✖3 = 60 marks
he does wrong = 10 questions
I.e. 10 ✖ 2 = 20

total marks = correct answer - wrong answer
= 60 - 20
= 40 marks
thus 20 answers are right

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