he temperature at mid-night 6. In a class test (+ 3) marks are given for every Correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores-5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly? descent starts (c) (d)
Answers & Comments
Step-by-step explanation:
I think there might be a missing part of the question related to temperature and descent starts, as it is not clear what the question is asking. However, I can answer the first part about the class test:
(i) For each correct answer, Radhika gets 3 marks, so for 12 correct answers, she gets 12 x 3 = 36 marks.
For each incorrect answer, she loses 2 marks, so let's say she has attempted x questions incorrectly, then she loses 2x marks.
She has attempted a total of (correct + incorrect) questions, which is 12 + x.
Her total score is 20 marks, so we can write an equation based on the above information:
36 - 2x = 20
Solving for x, we get x = 8.
Therefore, Radhika has attempted 12 + 8 = 20 questions in total, out of which 8 were attempted incorrectly.
(ii) For each correct answer, Mohini gets 3 marks, so for 7 correct answers, she gets 7 x 3 = 21 marks.
For each incorrect answer, she loses 2 marks, so let's say she has attempted y questions incorrectly, then she loses 2y marks.
Her total score is -5 marks, which means her marks have been reduced by 5 due to incorrect answers.
We can write an equation based on the above information:
21 - 2y = -5
Solving for y, we get y = 13/2.
This means Mohini has attempted 7 + 13/2 = 20.5 questions in total, out of which 13/2 were attempted incorrectly. Since it is not possible to attempt half a question, we can assume that Mohini attempted 13 questions incorrectly.
kindly mark brillent