In a test, +3 marks are given for every correct answer and -1 mark are given for every correct 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?
Answer:
Step-by-step explanation:
(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
Mark me brainliest please