Question

Years later, the sum of their ag be 56 years. what are their present ages?
13. there are 180 multiple choice questions in a test. a candidate gets 4 marks fo correct answer, and for every un-attempted or wrongly answered questions one deducted from the total score of correct answers. ifa candidate scored 450 mar test how many questions did he answer correctly?

Answer 1

Step-by-step explanation:

let correct answer =x

and incorrect answers=y

total 180 multiple choice questions

i.e x+y=180 ----(1)

total score 450 marks and get +4 marks for correct answer and -1 marks for incorrect answer

ie 4x-y=450-----(2)

adding equation (1) and (2)

5x= 630

X= 630/5 = 126

then y= 180-x = 180-126 = 54

hence correctly answer = 126