in a class test contains 10 questions 2 marks are given for each correct answer and -1 mark for wrong answer Tushar scored 15 marks and attempt all questions how many questions attempted correctly how many questions in correct
Answers
Step-by-step explanation:
let the no of right questions be X and no of wrong question be 10-x
2x+(10-x)*-1=15
2x-10+x=15
3x= 25
x=25/3
Let the number of correct answers of Tushar be x
Number of wrong answers be y
There are total 10 questions.
Hence, x + y = 10 ----- (i)
Now,
1 correct answer = 2 marks
x correct answers = 2 × x
= 2x
1 wrong answer = -1 mark
y wrong answers = -1y
Tushar scored 15 marks.
Therefore,
2x - 1y = 15 ----- (ii)
Adding (i) + (ii)
x + y + 2x - y = 10 + 15
→ 3x + 0 = 25
→ x = 25/3
Number of questions attempted correctly = 25/3
P.S. My steps and methods are correct but the answer should not have been in fraction cuz we never count in fractions. I hope you see your question again if it's a valid question or not.