New Learning Composite Mathematics Class 6 SK Gupta Anubhuti Gangal Algebra Chapter 7G Solution
(1) (a) 3a + 2 = 11
Or, 3a = 11 – 2
Or, 3a = 9
Or, a = 9/3
∴ a = 3
(b) 5P – 1 = 9
Or, 5P = 9 + 1
Or, 5P = 10
Or, P = 10/5
∴ P = 2
(c) 45 = – 7d – 4
Or, – 7d = 45 + 4
Or, – 7d = 49
Or, d = 49/-7
∴ d = – 7
(d) x/2 +10 = 13
Or, x/2 = 13 – 10
Or, x/2 = 3
Or, x = 3X2
∴ x = 6
(e) 9 (x – 3) = 54
Or, 9x – 27 = 54
Or, 9x = 54 + 27
Or, 9x = 81
Or, x = 81/9
∴ x = 9
(f) 17 = 3 (p – 5) + 8
Or, 17 = 3P – 15 + 8
Or, 3P = 17 + 15 – 8
Or, 3P = 24
∴ P = 24/3
= 8
(2) (a) 28 – f = 15
Or, – f = 15 – 28
Or, – f = – 13
∴ f = 13 (Ans)
(b) Let, the no. be x
(x X 7) – 18 = 31
Or, 7x – 18 = 31
Or, 7x = 31 + 18
Or, 7x = 49
Or, x = 49/7
∴ x = 7 (Ans)
Ex 7, h