. 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. (i) How
many incorrect answers has she attempted? (ii) How many questions were given in the test?
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Answer:
correct answers=+3marks
wrong answers=-1mark
sona scored 20 Marks with 10 correct answers
1)total score=20
correct answers=10
Mark's for correct answers=10×3=30
marks for incorrect answers=total score - Mark's for correct answer
=20-30=-10
incorrect answers= -10/-1=10
therefore she got 10 incorrect answers
2)correct answers=10
incorrect answers=10
total answers =20
therefore 20 questions were asked in the test
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