In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers.
(i) How many incorrect answers has she attempted?
(ii) How many questions were given in the test?
Answers
Answered by
84
she has attempted 10 incorrect answers
there were 20 questions
there were 20 questions
Dakshansh:
plzz mark as the brainliest
Answered by
259
(i)sona got 10 answers correct.
1 correct answer = 3 marks
10 correct answers = 10×3 = 30 marks
but she got only 20
1 wrong answer = -1 mark
that means she attempted 10 incorrect answers.
(ii) from (i) she made 10 incorrect answers
from the question 10 correct answers.
no.of questions in the test= no.of incorrect+ no.of correct answers
= 10+10= 20
1 correct answer = 3 marks
10 correct answers = 10×3 = 30 marks
but she got only 20
1 wrong answer = -1 mark
that means she attempted 10 incorrect answers.
(ii) from (i) she made 10 incorrect answers
from the question 10 correct answers.
no.of questions in the test= no.of incorrect+ no.of correct answers
= 10+10= 20
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