Q7. In a test (+5) marks are given for every correct answer and (-2) marks are given for every
incorrect answer.
(3)
(i)
Roy answered all the questions and scored 30 marks though he got 10 correct
answers.
Jay also answered all the questions and scored (-12) marks though he got 4 correct
answers. How many incorrect answers had they attempted?
Answers
Answered by
1
Roy -
No. of correct answers = 10
Total marks must be equal to 10*5
= 50
However, marks scored = 30
Total no. of incorrect answers
= (50-30)/2
= 20/2
= 10
Total no of questions
= Roy's correct + incorrect
= 10 + 10
= 20
Jay -
Total no of questions = 20
Total correct = 4
Incorrect
= 20-4
= 16
Therefore,
Roy - 10 incorrect answers
Jay - 16 incorrect answers
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Answered by
1
Answer:
Roy answered 20 questions, 10 answers are correct and 10 answers are incorrect.
Jay answered 20 questions, 4 answeres are correct and 16 answers are incorrect .
Step-by-step explanation:
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