8. In a class test containing 10 questions, 5 marks are awarded for every correct answer and
(-2) marks are awarded for every incorrect answer and 0 for each question not attempted.
(1) Ravi gets 4 correct and 6 incorrect answers. What is his score?
(11) Reenu gets 5 correct and 5 incorrect answers. What is her score?
(111) Heena gets 2 correct and 5 incorrect answers. What is her score?
Answers
Answer:
Step-by-step explanation:
In a class test containing 10 questions, 5 marks are awarded for every correct answer and (−2) for each wrong and 0 for not attempted questions.
So let us say for any student who gave x right questions and y wrong questions then total marks is given as 5x+(−2)y i.e
5x−2y total marks.
1) Ravi gets 4 correct and 6 incorrect so total score 5×4−2×6 i.e 8marks
2)Reenu gets 5 correct and 5 incorrect do total marks scored is equal to
5×5−2×5 i.e 15marks
3)Heena gets 2 correct and 5 incorrect. She attempts only 7 questions so for the remaining 3 questions she will score zero marks.
So total marks scored by Heena is 5×2−5×2+0 i.e 0marks
Answer:
1) ravi scored 8
2) reenu scored 15
3) heena scored 0
Step-by-step explanation:
1) correct answer=4
4x5=20
wrong answers=6
20-6times -2
=2x6=12
=20-12
=8
ans = ravi scored 8
2)correct answer=5
=5x5=25
incorrect answer=5times-2
=10
=25-10
=15
ans reenu scored 15
3)correct answer=2
=2x5=10
incorrect answer=5times-2
5x2=10
10-10
=0
ans heena scored 0
hope this helps