In a test +3 marks are given for every correct answer and (-1) marks are given for every incorrect answers. Sona attempted all questions and scored +20 marks though she got 10 correct answers. How many questions are given in the test, how many questions she answered incorrectly?
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Answer:
No. of questions Sona answered incorrect= 10/1= 10 questions
Total no. of questions= 10+10=20
Step-by-step explanation:
No. of marks for correct answer= +3
No. of marks for incorrect answer= -1
No. of questions Sona attempted correct= 10
Marks to be scores for for 10 correct answers= 10*(+3)= 30 marks
Sona's score = 20
Marks deducted= 30-20= 10 marks
No. of questions Sona answered incorrect= 10/1= 10 questions
Total no. of questions= 10+10=20
Hope it helps :)
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