Question

there are 100 questions in a test. 2marks are awarded for each correct answer and 1/3 marks are removed for each wrong answer. A girl scored 149.73 marks. She did not attempt 3 questions. How many answers of her were correct?
Please... Answer it step wise.​

Answer 1

Answer:

no of correct answer=78

Step-by-step explanation:

she attempted 97 questions

let X be no of correct answer and y be no of wrong answers,

then,

X+y=97.......(1)

2x-0.33y=149.73.......(2)

By elemination method

2x+2y=194

2x-0.33y=149.73

----------------------

2.33y=44.27

y=19

now,

X+y=97

X=78(as y=19)