In a test, +3 marks are given for every correct answer and -1 mark is
given for every incorrect answer. Sona attempted all the questions and
scored + 20 marks though she got 10 correct answers.
a) How many incorrect answers had she attempted?
Answers
Answered by
12
Answer:
10
Step-by-step explanation:
3*10=30
30-20=10
10/1=10
Sure
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