Question

In a test, (+ 5) marks are given for every correct answer and (−2) marks are given for

incorrect answer. Rachana attempted all the questions and scored 65, but only 15 of her

answers are correct. Find the number of incorrect answers.​

Answer 1

Answer:

1 = In a test, (+5) marks are given for every correct answer and ( −2 ) marks given for every incorrect answer. (i) Radhika answered all the questions and scored 30 marks though she got the 10 correct answers. (ii) Jay also answered all the questions and scored ( −12 ) marks though he got 4 correct answers.

2 = Marks given for one correct answer =4

So, marks given for 9 correct answers are

=4 X 9 = 36

Marks given for one incorrect answer

=-2

So, marks given for 6=(15-9) incorrect answers

= (-2) X 6 =-12

Therefore, Gurpreet's total score is

= 36 - 12 = 24

3 = n 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.

Step-by-step explanation: