Question

there are180 multiple choice questions in a test. a candidate gets 4 marks for every correct answer, and for every un-attempted or wrongly answered questions one mark is deducted from the total score of correct answers. lf a candidate scored 450 marks in the test how many questions did he answer correctly?

Answer 1

Total no. Of questions in the test = 180
Let his correct answers=x
Therefore wrong or unattempted
answers = 180-x
Marks he got for his right
answers =4×x
=4x
Marks he got for his wrong
answers= (180-x)
ATQ
4x-(180-x)=450
4x-180+x=450
5x=450+180
X=630/5
X=122
He answeres 122 questions correctly