18. In a class test containing ten questions, 5 marks are awarded for every correct answer and (-2) marks
are awarded for every incorrect answer and 0 for questions not attempted.
(i) Hari gets five correct and 3 incorrect answers. What is his score
(ii) Rimy gets six correct answers and four incorrect answer what is her score
(iii) Sameer gets two correct answers and five incorrect answers out of seven questions he attempts.
What is his score
(iv) Who got the highest mark and who got lowest mark?
(v) Meenu scored 16 marks. If she got 4 correct answer then how many question has she attempted in
correct? plz send me fast becz its very inportant
Answers
Answer:
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. We will just forget unattempted questions as it will give her 0 marks
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) Mohan gets 4 correct and 6 incorrect so total score 5×4−2×6 i.e 8marks
2)Reshma gets 5 correct anf 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:
Mohan get 4 correct answer = 4\times5\ =20\4×5 =20
He gets 6 incorrect answer = 6\times\left(-2\ \right)=\ -126×(−2 )= −12
Total score = 20-12\ =\ 8\20−12 = 8
Thus, mohan get 8 marks in the class test.
(ii) For 5 correct answer = 5\times5\ =\ 255×5 = 25
For 5 incorrect answer = 5\times\left(-2\right)=\ -105×(−2)= −10
Total score = 25-10\ =\ 1525−10 = 15
(iii) Heena get 2 correct answer = 5\times2=\ 105×2= 10
Heena get 5 incorrect = 5\times\left(-2\right)\ =\ -105×(−2) = −10
Total score = 10\ -10\ =\ 010 −10 = 0
Thus, total score of heena is zero.