Question

Question 6(ii)
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.
(ii) Mohini scores −5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?

Answer 1

ii) Marks obtained for 1 right answer = +3 Marksobtainedfor1wronganswer= -2

Marks scored by Mohini = -5
Marks obtained for 7 correct answers = 7$\times$ 3 = 21
Marks obtained for incorrect answers = Totals score - Marks obtained for 7 correct answers
= - 5 - 21 = - 26
Marks obtained for 1 wrong answer = - 2
Thus, number of incorrect answers = (-26) $÷$ (-2) = 13 Therefore, she attempted 13 questions wrongly.