in a test,+3marks are given for every correct answer and -1 mark are given for every incorrect answer. sone attempted all the 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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Marks given for 1 correct answer=3
marks given for 10 correct answer =10×3=30
Sone scores 20 marks
Therefore,marks obtained for incorrect answer=20-30=-10
marks given for 1 incorrect answer =-1
therefore,numbers of incorrect answer =(-10)÷(-1)=10
marks given for 10 incorrect answer =10×(-1)=-10
Total numbers of question were = 30+10=40
Hence,she attempted 10 incorrect answer and 40 question were given in the test.
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