Question

in a class test 3 marks are given for every correct answer and (-1) are given for every incorrect answer, total number of questions were 20.
i) Manav answered all questions but scored 20, though he solved 10 correctly. how many questions did he answer incorrectly?

Answer 1

Step-by-step explanation:

(i) The total correct answer given by Sona was 10 but she obtained 20 marks.

∵ 1 correct answer of 3 marks then

Marks cut for the incorrect answer =20−10×3=20−30=−10

From question, −1 mark is given for every incorrect answer.

Hence, total incorrect answers =

−1

−10

=10

(ii) Total correct answer given =10

Ans from part (i) we know that,

Total incorrect answer given =10

Therefore, the total question asked in the test (examination)=10+10=20