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Wittaler [7]
3 years ago
12

in a test +3 marks are given for every correct answer and -1 for every incorrect answer Mary attempted all questions and scored

+20 marks though she got 10 correct answers (1)how many incorrect answers has she attempted? (2)how many questions were given in the test?
Mathematics
1 answer:
AVprozaik [17]3 years ago
7 0

Answer:

10

20

Step-by-step explanation:

correct c=3 x 10

incorrect i=-1

-------

  • 3c-i=20
  • 3*10-i=20
  • i=10

incorrect= 10

number of questions= 10+10= 20

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