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please help class7 maths integers chapter:
In a competitive exam of 40 questions , +2 is rewarded for every correct answer

By Amaya

please help class7 maths integers chapter:
In a competitive exam of 40 questions , +2 is rewarded for every correct answer and ‐1 for every wrong answer. find the total score if a student had 12 wrong answers in his attempt of all the questions.
explanation with step by step with statement ​

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Amaya

Let B = { }, then
(a) B is the null set
(c) B is an infinite set
(b) B is a finite set
(d) B is not a set​

1. Which of the following are co-primes?
(a) 91 and 72 (b) 34 and 51 (c) 21 and 36 ld) 15 and 20

1 thought on “please help class7 maths integers chapter: <br />In a competitive exam of 40 questions , +2 is rewarded for every correct answer”

  1. Step-by-step explanation:

    student attempt all of the question = 40

    wrong answers = 12

    Mark deducted for the wrong answers = 12(-1) = -12

    correct answers = 40 – 12 = 28

    Mark rewarded for the correct answers = 28(2) = 56

    Total score = 56 – 12 = 44

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