In a class test (+ 3) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores –5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?
Answers
Answered by
1
Answer:
(i) 8
(ii) 13
Step-by-step explanation:
(i) Marks for correct answers= +3
Marks for incorrect answers= -2
ATQ
Score of Radhika= 20
Correct answers= 12
Correct points= 12x3
= 36
36=20+16
16 is missing which means that 16 marks are cut because of incorrect answers. 16 marks mean= 16/-2
= 2
= 8
(ii) Score of Mohini= -5
Correct answers= 7
Score= 7 x 3
= +21
Difference between 21-(-5)
= 21+5
= 26
= 26/2
= 13 incorrect answers
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