In an examination paper one mark is awarded for every correct answer while 1/4 marks are deducted fo

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19 Mar 2013 Problem

In an examination paper one mark is awarded for every correct answer while 1/4 marks are deducted for wrong answer. A student answered 120 questions and got 90 marks how may questions did he answer correctly.

OPtion

1) 24
2) 36
3) 40
4) 72
5) 80
6) 90
7) 96
8) 56
9) 64
10) None of these

Solution

let correct answer be x
wrong answer be y
by the given condition
x + y = 120 (i)
x(1) - y(1/4) = 90 (ii)
solve equations
x = 96
y = 24
correct answer 96
option 7

Correct Option: 7 Best Solution (0)