Question

in a test paper of Class 7 containing 30 questions 5 marks are awarded for every correct answer and -3 are awarded for every incorrect answer and zero for no answer naman scored 70 marks though he attempted 22 question then find how many questions had attempt incorrectly​

Answer 1

Answer:

5 questions

Step-by-step explanation:

Let the questions scored correctly by Naman be x.

The questions scored wrongly will be = 22 - x

We rewrite this as follows :

5x + [-3 (22 - x)] = 5x - 66 + 3x

5x + 3x - 66 = 70

8x = 70 + 66

8x = 136

x = 136/8

x = 17

The questions he got correct were 17 questions.

The questions he got wrong were :

22 - 17 = 5

He got 5 questions wrong.

The answer is therefore 5.