Chapter 2 Linear Equations in One Variable Exercise 2.6
Chapter 2 Linear Equations in One Variable Exercise 2.6 Question 1. Question 2. Question 3. Question 4. Question 5. Question 6. The ages of Hari and Harry are in the ratio 5 : 7. Four years from now the ratio of their ages will be 3 : 4. Find their present ages. Solution: Let the […]
Chapter 2 Linear Equations in One Variable Exercise 2.5
Chapter 2 Linear Equations in One Variable Exercise 2.5 Question 1. Solution: Question 2. Solution: LCM of 2, 4 and 6 = 12 (Multiplying both sides by 12) ⇒ 6n – 9n + 10n = 252 ⇒ 7n = 252 ⇒ n = 252 ÷ 7 ⇒ n = 36 Question 3. Solution: ⇒ -10x […]
Chapter 2 Linear Equations in One Variable Exercise 2.4
Chapter 2 Linear Equations in One Variable Exercise 2.4 Question 2. A positive number is 5 times another number. If 21 is added to both the numbers, then one of the new numbers becomes twice the other number. What are the numbers? Solution: Let the positive number be x. Other number = 5x Condition I: […]
Chapter 2 Linear Equations in One Variable Exercise 2.3
Chapter 2 Linear Equations in One Variable Exercise 2.3 Question 1. 3x = 2x + 18 Solution: We have 3x = 2x + 18 ⇒ 3x – 2x = 18 (Transposing 2x to LHS) ⇒ x = 18 Hence, x = 18 is the required solution. Check: 3x = 2x + 18 Putting x = […]
Chapter 2 Linear Equations in One Variable Exercise 2.2
Chapter 2 Linear Equations in One Variable Exercise 2.2 Solution: Let the required number be x. Question 2. The perimeter of a rectangular swimming pool is 154 m. Its length is 2 m more than twice its breadth. What are the length and the breadth of the pool? Solution: Let the breadth of the pool […]
Chapter 2 Linear Equations in One Variable Exercise 2.1
Chapter 2 Linear Equations in One Variable Exercise 2.1 Question 1. Solve the equation: x – 2 = 7. Solution: Given: x – 2 = 7 ⇒ x – 2 + 2 = 7 + 2 (adding 2 on both sides) ⇒ x = 9 (Required solution) Question 2. Solve the equation: y + 3 […]
Chapter 1 Rational Numbers
Chapter 1 Rational Numbers Extra Questions Very Short Answer Type Question 1. Question 4. Question 5. What is the multiplicative identity of rational numbers? Solution: 1 is the multiplicating identity of rational numbers. Question 6. What is the additive identity of rational numbers? Solution: 0 is the additive identity of rational numbers. Solution: Short Answer […]
Chapter 1 Rational Numbers Exercise 1.2
Chapter 1 Rational Numbers Exercise 1.2 Question 1. Represent these numbers on the number line Question 2. Solution: Question 5. Find five rational numbers between Solution: Question 6. Question 7.
Chapter 1 Rational Numbers Exercise 1.1
Chapter 1 Rational Numbers Exercise 1.1 Question 1. Using appropriate properties find: Solution: Question 2. Write the additive inverse of each of the following: Solution: Question 3. Verify that -(-x) = x for Solution: Question 4. Find the multiplicative inverse of the following: Solution: Question 5. Name the property under multiplication used in each of […]
Class 12 Going Places MCQ
Q1. Danny had a freckled nose and the colour of his eyes was (i) grey (ii) green (iii) blue (iv) brown Correct Answer (ii) green Q2. Outside the pub, Sophie saw something. It was (i) her dad’s bicycle (ii) her brother’s car (iii) her mother’s motorcycle (iv) Derek’s tricycle Correct Answer (i) her dad’s bicycle […]