82coogs
15.06.2020 •
Mathematics
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?
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Ответ:
10
20
Step-by-step explanation:
correct c=3 x 10
incorrect i=-1
3c-i=203*10-i=20i=10incorrect= 10
number of questions= 10+10= 20
Ответ: