Question

An instructor scored a student's test of 50 questions by giving 2 marks for a right answer and -1 for incorrect answer. if the score is 76, find out the number of right answers.

Answer 1

Answer:

let no of correct and incorrect answers be x and 50-x

2*x+-1*(50-x)=76

2x-50+x=76

3x=126

x=42

42 correct answers and 8 incorrect answers