Question

in a class test of 10 questions 3 marks are awarded for every correct answer and 2 marks are given for every in correct answers no marks are given for uattempted questions . bob answers 2 questions correctly but scored - 4 marks how many questions did he got wrong

Answer 1

Answer:

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

follow this formula