Question

In a question paper there are 100 questions. Each correct fetches 3 marks and for each incorrect answer 1 marks is deducted. A student attempt 90 questions and scores 158 marks in total. How many questions did he get wrong?

Answer 1

Answer:

total questions attempted=90

if correctly answered questions=x

then incorrectly answered questions=90-x

A.T.Q.

3x+(90-x)×(-1) =158

3x-90+x=158

4x=158+90

4x=248

x=62

correctly answered questions=62

incorrectly answered questions=90-62=28

so the ans.28