In a competitive examination, one mark is awarded for each correct answer while
1
2
mark is deducted for every wrong answer. Jayanti answered 120 questions
and got 90 marks. How many questions did she answer correctly?
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In a competitive examination, one mark is awarded for each correct answer while
1
2
mark is deducted for every wrong answer. Jayanti answered 120 questions
and got 90 marks. How many questions did she answer correctly?
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Answer:
let right answers be x and wrong answers been y
x+y=120
x=120-y and
x-2y=90
120-y-2y=90
3y=120-90
y=30/3=10
as x+y=120
x+10=120
x120-10=110