Question

In a test (+4) marks are given for every correct answer & (-2) for every wrong answer.

a. Niharika answered all the questions and scored 20 marks though she got

10 correct answers.

b. Amitesh also answered all the questions and scored (-10) marks though

he got 5 correct answers.

Find the number of incorrect answers they attempted.



Please give answer fast, really need your help.

Answer 1

Answer:-

Niharika's no of incorrect answers = 10

Amitesh's no of incorrect answers = 15

Step-by-step explanation:

Let,

x denote the number of correct answers

y denote the number of incorrect answers

a) Niharika:

Since, she got 10 correct answers,

Total score for correct answers = 10*4 = 40

For y incorrect answers,

Total score for incorrect answers = - 2y

Total score = 20

Hence, 40 + (-2y) = 20

y = 10

b) Amitesh :

Since, he got 5 correct answers,

Total score for correct answers = 5*4 = 20

For y incorrect answers,

Total score for incorrect answers = - 2y

Total score = - 10

Hence, 20 + (-2y) = - 10

y = 15

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