Question

In a test (+4) marks are given for every correct answer and (-1) mark is given for every incorrect answer. Ramu answered all the questions and scored 75 marks though he got 20 correct answers. How many incorrect answers had he attempted?​

Answer 1

Answer:

Correct option is

C

5,9

Case 1: Asha scored =26 marks

Correct answer by Asha =9

Let incorrect answers by Asha be x

According to question, 9(4)+x(−2)=26

−2x=26−36

⇒x=5.

Incorrect answers by Asha =5

Case 2: Varun scored =2 marks

Correct answers by Varun =5

Let incorrect answers by Varun be y

According to question, we have

5(4)+y(−2)=2⇒−2y=2−20⇒y=9

Incorrect answers by Varun =9

Step-by-step explanation:

PLEASE MARK BRAINLESTA AND FOLLOW

Answer 2

Answer:

Marks given for one correct answer = 5

So, marks given for 10 correct answers

= 5 X 10 = 50

Radhika's score = 30

Marks obtained for incorrect answer

= 30- 50 = -20

Marks given for one incorrect answer

= (-2)

Therefore, number of incorrect answers

= (−20)÷(−2)=10