Question

In a test ,+3 marks are given for every correct answer and-1 Marks is given for every incorrect answer.sona attemped all questions and got 10 answers correct.but her total score was only +20.
(a) how many incorrect answers did she give?
(b) how many questions were given in the test?


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Answer 1

Answer:

(a) 10

(b) 20

Step-by-step explanation:

Let the no of total questions be x

No. of right answer = 10

No. of wrong answers = x-10

So, 3*10 - 1(x-10) = 20

30 - x +10 =20

x = 20

So, total no. of questions = 20

No. of incorrect answers = 20-10 =10