Question

b)In a test (+5) marks are given for every correct answer and (–2) marks are given for every
incorrect answer. (i) Radhika answered all the questions and scored 30 marks though she got
10 correct answers. (ii) Jay also answered all the questions and scored (–12) marks though he got 4
correct answers. How many incorrect answers had they attempted?

Answer 1

Answer:

Marks given for one correct answer = 5

So, marks given for 10 correct answers  

= 5 X 10 = 50

Radhika's score = 30

Marks obtained for incorrect answer

= 30- 50 = -20

Marks given for one incorrect answer  

= (-2)

Therefore, number of incorrect answers

= (−20)÷(−2)=10

Therefore, the number of incorrect answers they both attempted is 10 .

Hope my answer is helpful for many..

Answer 2

Answer:

For Radhiika,

10 correct answer = 10 * 5 = 50

Total points = 30

So, Incorrect points = 30 - 50 = -20

---> incorrect answer = -20 / -2 = 10

For Jay,

4 correct answer = 4* 5 = 20

Total points =  -12

So, Incorrect points = -12 -20 = -32

----> Incorrect answer = -32 / - 2 = 16