Question

In a test +3 marks are given for every correct ans and -1 marks are given for every incorrect

ans and no marks are provided for not attempting the question. Find

a) What is total marks obtained by a student if she got 10 answers correct and two

incorrect.

b) If one student scored +20 marks and she got 10 answers correct after attempting all the

questions, then how many answers did she get wrong?​

Answer 1

Answer:

a) 28

b)

Step-by-step explanation:

a) marks given for every correct answer= +3

   marks given for 10 correct answer= 3 multiply by 10= 30

 marks given for every incorrect answer= -1

 marks given for 2 incorrect answer= -1 multiply by 2= -2

Total marks obtained= 30-2= 28

b) marks given for every correct answer= +3

   marks given for 10 correct answer= 3 multiply by 10= 30

let the no. of incorrect answers be L.

 marks given for every incorrect answer= -1

 marks given for L incorrect answer= -1 multiply by L= 30-20

                    =10

Verification:-

a) 30-2=28

   28=28

b) 30-10= 20

  20=20