Question

7. In a class test, 5 marks are given for each correct answer and -2 for each incorrect answer.
Aaryav answered all the questions and scored 30 marks, though he got 10 correct answers.
Find the number of questions Aaryav answered incorrectly.​

Answer 1

Answer:

10

Explanation:

Let,Total questions = X

Correct answers = 10

Incorrect answers = X-10

ATQ,

10×5 -2(X-10) = 30

50 - 2X + 20 = 30

-2X=30-70

-2X = -40

X = 20

Total questions=20

Incorrect answers = 20-10

Incorrect answers = 10