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# Class 7 NCERT Solutions Maths Chapter 1 - Integers

## Integers Exercise Ex. 1.1

### Solution 1 ### Solution 2 ### Solution 3 ### Solution 4 ## Integers Exercise Ex. 1.2

### Solution 1 ### Solution 2 ### Solution 3 ### Solution 4 ## Integers Exercise Ex. 1.3

### Solution 1 ### Solution 2 ### Solution 3 ### Solution 4 ### Solution 5 ### Solution 6

Marks obtained for 1 right answer = + 3

Marks obtained for 1 wrong answer = - 2

(i) Marks scored by Radhika = 20

Marks obtained for 12 correct answer = 12 × 3 = 36

Marks obtained for incorrect answers = Total score - Marks obtained for 12 correct answers

= 20 - 36

= - 16

Marks obtained for 1 wrong answer = - 2

Thus, number of incorrect answers = (- 16) ÷ (- 2) = 8

So, she attempted 8 questions wrongly.

(ii) Marks scored by Mohini = - 5

Marks obtained for 7 correct answers = 7 × 3 = 21

Marks obtained for incorrect answers = Total score - Marks obtained for 12 correct answers

= - 5 - 21

= - 26

Marks obtained for 1 wrong answer = - 2

Thus, number of incorrect answers = (- 26) ¸ (- 2) = 13

So, she attempted 13 questions wrongly.

### Solution 7 