Question

there are 40 questions in the test booklet of mathematics olympiad. Stephen scores 80 marks when 5 marks are awarded for each correct answer and 3 marks is deducted for each incorrect answer then find the number of correct answer attempted by Stephen.

Answer 1

माना सही उत्तर के अंक =x
Wrong answer =y

प्रश्नानुसार,
x+y=40
5x-3y=80
समी.को 3से गुणा करने पर,
3x+3y=120
5x-3y=80
8x=200
x=25
25+y=40
y=15