Question

in a test (+3) marks are given for every correct answer and (-1) for every incorrect answer.of Sona attempted all the questions and got (+20) marks by answering correct answers
a) how many incorrect answer has she attempted​

Answer 1

Answer:

(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