Question

In a competitive examination, there were $60$ questions. The correct answer would carry $2$ marks, and for incorrect answer $1$ mark would be subtracted. Yashwant had attempted all the question and he got total marks. Then how many question he got wrong ?

Answer 1

Given that,

total no. of questions $=60$

so, total marks $=60\times 2=120$

therefore,

If a question is attempted and is still wrong then the no. of

$=2[2$ mark for question]$+1[$for wrong answer]

$=2+1=3$

then,

marks scored $=90$

so,

mark cost $=120-90=30$

So, No. of questions get wrong $=\frac{30}{3}=10$

Hence, this is the answer.