Question

018. In a class test, 3 marks are awarded for every correct answer and (-2) marks
are awarded for every incorrect answer and no marks not attempting any
question. Radhika scored 25 marks. If she has got 15 correct answers, how
many questions has she attempted incorrectly?

Answer 1

Answer:

I am sorry I am currently unable to answer to your question but our teacher has given this type of question in our assignment. Go through the explanation. Hope you will understand.

Step-by-step explanation:

(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