Class 11 Maths NCERT Solutions For Chapter 6 Linear Inequalities

Chapter 6 Linear Inequalities

Download NCERT Solutions for Class 11 Mathematics

(Link of Pdf file is given below at the end of the Questions List)

In this pdf file you can see answers of following Questions

EXERCISE 6.1

Question 1. Solve 24x < 100, when
(i) x is a natural number.
(ii) x is an integer.

Question 2.Solve – 12x > 30, when
(i) x is a natural number.
(ii) x is an integer.

Question 3. Solve 5x – 3 < 7, when
(i) x is an integer.
(ii) x is a real number.

Question 4. Solve 3x + 8 >2, when
(i) x is an integer.
(ii) x is a real number. Solve the inequalities in Exercises 5 to 16 for real x.

Question 5. 4x + 3 < 6x + 7

Question 6. 3x – 7 > 5x – 1

Question 7. 3(x – 1) ≤ 2 (x – 3)

Question 8.3 (2 – x) ≥ 2 (1 – x)

Question 9. 11 2 3 x + x + x <

Question 10. 1 3 2 x x > +

Question 11. 3( 2) 5(2 ) 5 3 x − − x ≤

Question 12. 1 3 4 1 ( 6) 2 5 3 x + ⎞≥ x −

Question 13. 2 (2x + 3) – 10 < 6 (x – 2)

Question 14. 37 – (3x + 5) > 9x – 8 (x – 3)

Question 15. (5 2) (7 3) 4 3 5 x x− x − < −

Question 16. (2 1) (3 2) (2 ) 3 4 5 x − x − − x ≥ −

Solve the inequalities in Exercises 17 to 20 and show the graph of the solution in each case on number line

Question 17. 3x – 2 < 2x + 1

Question 18. 5x – 3 > 3x – 5

Question 19. 3 (1 – x) < 2 (x + 4)

Question 20. (5 2) (7 3) 2 3 5 x x − x − < −

Question 21. Ravi obtained 70 and 75 marks in first two unit test. Find the number if minimum marks he should get in the third test to have an average of at least 60 marks.

Question 22. To receive Grade ‘A’ in a course, one must obtain an average of 90 marks or more in five examinations (each of 100 marks). If Sunita’s marks in first four examinations are 87, 92, 94 and 95, find minimum marks that Sunita must obtain in fifth examination to get grade ‘A’ in the course.

Question 23. Find all pairs of consecutive odd positive integers both of which are smaller than 10 such that their sum is more than 11.

Question 24. Find all pairs of consecutive even positive integers, both of which are larger than 5 such that their sum is less than 23.

Question 25. The longest side of a triangle is 3 times the shortest side and the third side is 2 cm shorter than the longest side. If the perimeter of the triangle is at least 61 cm, find the minimum length of the shortest side.

Question 26. A man wants to cut three lengths from a single piece of board of length 91cm. The second length is to be 3cm longer than the shortest and the third length is to be twice as long as the shortest. What are the possible lengths of the shortest board if the third piece is to be at least 5cm longer than the second? [Hint: If x is the length of the shortest board, then x , (x + 3) and 2x are the lengths of the second and third piece, respectively. Thus, x + (x + 3) + 2x ≤ 91 and 2x ≥ (x + 3) + 5]

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