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Practice Time 5E 11. 18r + 6b
17 −15 Maths Connect
1. (a) –16 (b) (c) (d) 4
2 2 (a) 22x + 60y (b) 8x + 14y
(e) 11 (f) 6
2. (a) 5 (b) 4 (c) –7 (d) 0 Chapter 6: Simple Equations
−7 Let’s Recall
(e) 125 (f) (g) 25 1. 4x + 3, 7 pq – pr
6
3. 32000 m 4. (a) 32 cm (b) 3 cm 2. Terms Irreducible Factors
2
5. No. of Sides Polygon –5xy 2 –5, x, y, y
2
(a) 12 dodecagon –6x y –1, 2, 3, x, x, y
(b) 8 Octagon 18xy 2, 3, 3, x, y
(c) 5 Pentagon
(d) 24 icositetragon 3. 1 bc
3
Practice Time 5F 2
1. (a) 6x (b) a (c) 48pq (d) 17xy 4. (a) −1 (b) 14 (c) 25 (d) 2
2. (a) 4xy (b) –10xy (c) 10xy (d) –4xy 2
3. (a) 3x + y + z (b) 5ab – 4bc + 2ca 5. (a) 2x + 6y–z (b) 3pq-6r
(c) 2x – 3xy + 10 (d) 6pq – 2qr – rp Think and Answer
4. (a) –2a – 9b + 4c (b) –3x + 3y + z 2l + 7 = 18
(c) pq + 7p + q (d) 4xy + 6y – 3x
5. 2x – 2y 6. 2mn + n + 2m – 3 7. p + 3q – 7 Quick Check
8. (i) – xy + 2y + 1 (ii) 2x + xy + 1 9. (6x + 3y) units 10. y units 12
Mental Maths Practice Time 6A
1. –5 2. a b , 1000 3. Less than 1. (a) x + 8 = 17 (b) 3y – 9 = 13 (c) 8 – 2m = 7 (d) 3p – 11 = 32
3 3
Chapter Assessment (e) x +1 = 3 x
A. 1. (b) 2. (c) 3. (a) 4. (a) 3 4
5. (d) 6. (c) 7. (b) 8. (a) 2. (a) 7 more than the number x gives 63.
9. (d) 10. (c) (b) 1 is subtracted from the product of x and 3 gives 16.
B. 1. (c) 2. (a) 3. (a) (c) The sum of 1 and the product of 4 and y gives 29.
C. (a) - (v) (b) - (iii) (c) - (iv) (d) - (i) (d) The quotient of three times a number n and 5 gives 6.
(e) - (vii) (f) - (viii) (g) - (vi) (h) - (ii) (e) 1 is subtracted from the product of 2 and u gives 1 .
D. 1. (a) 25 (b) –3 (c)   17  4 2
 6  (f) The quotient of a number t and 3 added to 1 gives 4.
2. 36x + 24y; 156 3. (a) 12 (b) 3x – 12 (c) 2088 (g) 7 is subtracted from the product of 2 and m gives 0.
4. 1 + 2n, yes 5. 1 xyz 6. 2x − 5 7. 50x + 350 (h) 7 is subtracted from the quotient of three times a number k and 4
gives 6.
2 3 4. (a) x = 3 (b) p = 5 (c) a = 6
8. (a) 15 (b) 357 9. 14x + 2y 5. (a) 8b = 150 (b) p – 5 = 12 (c) 2y + 13 = 32
10. (a) 1 1 5 1 Maths Connect
8x + 32 = 398
1 1
1 Practice Time 6B
1 1 1 8 2 Rule → 3n + 2 1. (a) x = 5 (b) x = 11 (c) x = 8 (d) y = 24
1 1 (e) x = 4 (f) z = 12 (g) t = 5 (h) y = 12
7
1 1 1 (i) y = 2 (j) y = 2 (k) p = –4 (l) y = 2
1 1 1 1 1 11 3 5
(m) n = 7 (n) u = 3
1 1 2
1 1 1 1 Practice Time 6C

(b) 1 6 1 1. (a) x = 3 (b) y = −45 (c) y = –4 (d) p = 3
1 1 7
(e) p = 27 (f) x = 5 (g) t = 7 (h) x = 4.5
1 1 1 (i) x = 10 (j) t = 17 (k) a = –2 (l) x = 2
1 10 2 Rule → 4n + 2 2. (a) 4x = –8, x + 4 = 2, 5x + 2 = –8, x – 3 = –5
1 1 1 x
1 (b) x + 8 = 12, + 7 = 8 , 5x –10 = 10, x – 7 = –3 (Answer may vary)
1 4
1 1 1 Think and Answer
1
1 1 14 3 7x + 50 = 300; 250
1 1 1 1 1 7
1 1 Practice Time 6D
1 1 1. 9 2. 2 3. 7 4. 35, 40
1 1
1 5. Length = 16, breadth = 8 6. 36 boys 7. 30 8. 6
Mathematics-7 360