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State which of the following are equations (with a variable). Give reason for your answer. Identify the variable from the equations with a variable. (a) 17 = x + 17 (b) (t – 7) > 5 (c) 4 / 2 = 2 (d) (7 × 3) – 19 = 8 (e) 5 × 4 – 8 = 2x (f) x – 2 = 0 (g) 2m < 30 (h) 2n + 1 = 11 (i) 7 = (11 × 5) - (12 × 4) (j) 7 = (11 × 2) + p (k) 20 = 5y (l) 3q/ 2 < 5 (m) z + 12 > 24 (n) 20 – (10 – 5) = 3 × 5 (o) 7 – x = 5

Solution (a) 17 = x + 17 :An equation with variable x  (b) (t – 7) > 5: An inequality equation (c) 4 / 2 = 2: No, it’s a... View Article

(a) Given Munnu’s age to be x years, can you guess what (x – 2) may show? Can you guess what (x + 4) may show? What (3x + 7) may show? (b) Given Sara’s age today to be y years. Think of her age in the future or in the past. What will the following expression indicate? Y + 7, y – 3, NCERT Solutions for Class 6 Maths Chapter 11 Exercise 11.4 – 2, NCERT Solutions for Class 6 Maths Chapter 11 Exercise 11.4 – 3 (c) Given n students in the class like football, what may 2n shows? What may n / 2 show?

Solution (a)(x – 2) denotes the person whose age is (x – 2) years and he is 2 years younger to Munnu (x + 4) denotes the person whose age is (x... View Article

Change the following statements using expressions into statements in ordinary language. (For example, Given Salim scores r runs in a cricket match, Nalin scores (r + 15) runs. In ordinary language – Nalin scores 15 runs more than Salim.) (a) A notebook costs ₹ p. A book costs ₹ 3p (b) Tony put q marbles on the table. He has 8 q marbles in his box. (c) Our class has n students. The school has 20 n students. (d) Jaggu is z years old. His uncle is 4z years old and his aunt is (4z – 3) years old. (e) In an arrangement of dots there are r rows. Each row contains 5 dots

Solution (a)A book costs 3 times the costs of a notebook. (b) Tony’s box contains 8 times the number of marbles on the table (c) Total... View Article

Answer the following: (a) Take Sarita’s present age to be y years (i) What will be her age 5 years from now? (ii) What was her age 3 years back? (iii) Sarita’s grandfather is 6 times her age. What is the age of her grandfather? (iv) Grandmother is two year younger than grandfather. What is grandmother’s age? (v) Sarita’s father’s age is 5 years more than 3 times Sarita’s age. What is her father’s age? (b) The length of a rectangular hall is 4 meters less than three times the breadth of the hall. What is the length, if the breadth is b meters? (c) A rectangular box has height h cm. Its length is 5 times the height and breadth is 10 cm less than the length. Express the length and the breadth of the box in terms of the height. (d) Meena, Beena and Reena are climbing the steps to the hill top. Meena is at step s, Beena is 8 steps ahead and Leena 7 steps behind. Where are Beena and Meena? The total number of steps to the hill top is 10 less than 4 times what Meena has reached. Express the total number of steps using s. (e) A bus travels at v km per hour. It is going from Daspur to Beespur. After the bus has travelled 5 hours, Beespur is still 20 km away. What is the distance from Daspur to Beespur? Express it using v.

Solution (a)Sarita's present age is years (i) Sarita’s age aftyer 5 years from now = Sarita’s present age + 5 = (y + 5) years (ii)... View Article

Give expressions in the following cases. (a) 11 added to 2m (b) 11 subtracted from 2m (c) 5 times y to which 3 is added (d) 5 times y from which 3 is subtracted (e) y is multiplied by -8 (f) y is multiplied by -8 and then 5 is added to the result (g) y is multiplied by 5 and the result is subtracted from 16 (h) y is multiplied by -5 and the result is added to 16.

Solution (a)11 added to 2m can be expressed as => (2m + 11) (b) 11 subtracted from 2m can be expressed as => (2m – 11) (c) 5 times... View Article