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 and correctly?
Answers
Answered by
4
right=x
wrong=x-120
total=x+x-120
=2x-120=90
=2x=90+120
=2x=210
=x=105
correct ans=105
wrong ans=105-90
Similar questions