please answer my question it's very urgent
Answers
Answer:
Hope it helps you mate......please mark as brainliest
Step-by-step explanation:
So here,3 marks are given for a correct answer and -2 for every incorrect answer.
1) Answered 20 questions.So if all are correct she should get20*3=60 marks.
But she answered only 12 correctly=12*3=36 marks.
Number of incorrect answers are 60-36=24.
So for every incorrect answer -2.So,24/2=12 incorrect answers.
2)7 correct answers=7*3=21 marks.
But she only got -5.So,21-5=24 marks.
So she attempted 24/2=12 answers incorrectly
Answer:
(i) Incorrect answers = 8
(ii) Incorrect answers = 13
Step-by-step explanation:
Marks for correct answers = +3
Marks for incorrect answer = -2
Marks for not attempted question = 0
(i) Radhika:
Marks scored = 20
Correct answers = 12
Correct answers mark = 12 × 3 = 36
Incorrect answer = x
Incorrect answers mark = x × -2 = -2x
36 - 2x = 20
-2x = 20 - 36
-2x = -16
x = -16/-2
x = 8
Check ⇒
Marks scored = 20
Correct answers = 12
Correct answers mark = 12 × 3 = 36
Incorrect answer = 8
Incorrect answers mark = 8 × -2 = -16
36 - 16 = 20
20 = 20
L.H.S = R.H.S
Hence, verified
The answer is correct.
(ii) Mohini:
Marks scored = -5
Correct answers = 7
Correct answers mark = 7 × 3 = 21
Incorrect answers = x
Incorrect answers mark = x × -2 = -2x
-2x + 21 = -5
-2x = -5 - 21
-2x = -26
x = -26/-2
x = 26/2
x = 13
Check ⇒
Marks scored = -5
Correct answers = 7
Correct answers mark = 7 × 3 = 21
Incorrect answers = x = 13
Incorrect answers mark = x × -2 = -2 × 13 = -26
-26 + 21 = -5
-5 = -5
L.H.S = R.H.S
Hence, verified.
The answer is correct.