Question

In a test(+5) marks are given for every correct answer and (-2) mart
for every incorrect answer. (i) Radhika answered all the questions 21
marks through 10 correct answers. (ii) Jaya also answered all the ques
scored (-12) marks through 4 correct answers. How many incorrecta
both Radhika and Jaya 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

Answer 2

Let Total no of Question be X

She Has Given 10 Correct Answers

So, Incorrect Ans be X-10

Equation forms (10*5)+(X-10)*-2=21

50+(-2X)+10=21

50-2X+10=21

60-2X=21

60-21=2X

39=2X

X=19.5

Approx There are 20 Question And she answer 10 Ans Correct So Incorrect Ans be 20-10=10

Jaya given 4 Correct Ans so Incorrect be 20-4=16  incorrect Ans

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