Question

In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. if he attempts all 60 questions and secures 130 marks, the no of questions he attempts correctly is

Answer 1

let the no. of qyestions e answered correctly be x

let the no. of questions he answered wrong be y

total no. of questions =

x+y=60

y=60-x------eqn 1

4x-y=130

4x-60+x=130

5x=130+60

5x=190

x=190/5

x=38

therefore, the no. of questions he answered correctly=38