Question

2. In a multiple choice question paper containing 50 questions, a student is
awarded +2 marks for every correct answer and -1 mark for every wrong
answer. If Amisha attempted all the 50 questions and scored +40 marks.
Find the number of correct answers and incorrect answers given by
Amisha

Answer 1

Answer:

Correct answers given = 30

Wrong answers given = 20

Step-by-step explanation:

Let, x - number of correct answers and y - number of wrong answers

we know that, x + y = 50 (since student attended all 50 questions)

(+2 * x) + (-1 * y) = 40 (mark of the student) ---> 2x - y = 40

solving x + y = 50 and 2x - y = 40,

we get, 3x = 90 ----> x = 30

substituting x value,

30 + y = 50

y = 20

Answer 2

Step-by-step explanation:

Amisha answered 20 que correct & scored 40 marks

According to the question

Amisha attempted all que so,

50-20=30

Amisha answered 30 que incorrect

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