Question

In a class test 4 marks is awarded to every class test,2 mark are deducted for every incorrect answer and no marks are are given for not attempting question. Ravi scores 20 marks. If he has got 8 incorrect answer, how many questions has attempted incorrectly?​

Answer 1

Answer:

Q6) 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?

Solution 6)

(i) In a class test,

marks given for every correct answer = 3

marks given for 12 correct answer = 12\times3\ =\ 3612×3 = 36

radhika obtained 20 marks in the class testt

therefore, marks obtained for incorrect answer = 20 -36

= -16

therefore, marks given for one incorrect answer = -2

so, no of incorrect answer = -16\times\frac{-1}{2}\ \ \ =\ 8\−16×

2

−1

= 8

Thus, radhika has attempted = 8 incorrect questions

(ii) Marks given for seven correct answer = 3\times7\ =21\3×7 =21

Mohini scores = -5

Marks obtained for incorrrect answer = -5-21 = -26

now, marks given for one incorrect answer = -2

therefore, no of incorrect answer Mohini has attempted = -26\times\frac{-1}{2}\ \ =13\ incorrect\ question−26×

2

−1

=13 incorrect question

Answer 2

Answer:

6 incorrect answers

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