Question

In a class test (+4) marks are given for every correct answer and (–2) marks are given for

every incorrect answer and no mark for not attempting any question.

a) Reena scored 20 marks. If she has got 10 correct answers, how many questions has she

attempted incorrectly?

b) Seema scores –6 marks in this test, though she has got 8 correct answers. How many

questions has she attempted incorrectly?​

Answer 1

Answer:

a) In a class test,

Reena got 10 correct answer

therefore, Mark's obtained by reena for every correct answer = 10×4 = 40

but she scored 20 marks

therefore, deduct Mark's are 40 - 20 = 20 Mark's

so, the question attempted incorrectly by reena is

20 ÷ 2 = 10. (-2 is for every incorrect answer)

10 question are incorrectly attempt by Reena.

b) correct answer attempt by seema are 8×4 = 32

and she scored -6 marks in test.

therefore,

32 - (-6)

32 + 6

38

we know that -2 is for every incorrect answer

so, incorrect question attempt by seema are

38 ÷ 2 = 19 Ans