There are 180 questions in an exam.Each contain 4marks .For every wrong and left questions 1 mark is deducted.if a student got 360 marks.How many questions did he answerd correctly.
Answers
Answered by
2
Let the total correct question be x
Then total marks got will be =4x-(180-x) (because of negative marking we have to subtract
Now ATQ
4x-(180-x)=360
4x+x=360+180
5x=540
X=108
Then total marks got will be =4x-(180-x) (because of negative marking we have to subtract
Now ATQ
4x-(180-x)=360
4x+x=360+180
5x=540
X=108
Answered by
1
let 'c' be the number of correctly answered questions.
let 'w' be the number of wrongly answered questions.
c+w=180 [total questions] ...1
4c-w=360[total mark]....2
simplyfy
adding 1 and 2
5c=540
c=108
so correctly answered questions is 108
wrongly answered = 180-108 = 72
answer 108
let 'w' be the number of wrongly answered questions.
c+w=180 [total questions] ...1
4c-w=360[total mark]....2
simplyfy
adding 1 and 2
5c=540
c=108
so correctly answered questions is 108
wrongly answered = 180-108 = 72
answer 108
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