in a class test +5 marks for correct answer. -2 marks for incorrect . no marks for not attempt. A scored 80 marks . if A has got 20 correct answer. how many questions are incorrect. B scored 0 marks. B has got 10 correct answer . How many incorrect? C scored -5 by attempting 13 questions. How many are correct and incorrect?
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Answer:
A scored 80 marks.
correct answers =20
marks=20×+5=+100
but secured 80 marks..
incorrect questions=100-80=20,
20÷-2=10 Questions..
B has scored 0 marks.
but answered 10 correct. marks=10×+5=+50
incorrect marks=50-0=50
Incorrect questions=50÷-2=25 questions.
C scored -5 marks
attempt 13 questions=so 10+3
3 correct answer 3×5=+15
10 incorrect=10×-2=-20
total marks secured=-20+15=-5 marks..
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