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Practice time 9A think tank (Page 189)
1. (a) (i) (b) (iii) `128
2. (a) 3:20 a.m. (b) 4:28 a.m. (c) 9:37 a.m. (d) 2:29 p.m. Challenge Question (Page 192)
(e) 1:30 p.m. (f) 5:40 p.m. (g) 6:25 p.m. (h) 12:00 a.m. Profit, `1400
(i) 10:22 p.m. (j) 9:38 p.m. (k) 1:48 p.m. (l) 8 p.m.
3. (a) 0140 hours (b) 0457 hours (c) 0006 hours (d) 0605 hours think tank (Page 193)
(e) 1024 hours (f) 1936 hours (g) 1215 hours (h) 1417 hours No profit, No loss
(i) 2300 hours (j) 2400 hours or 0000 hours (k) 1530 hours Practice time 10B
(i) 2140 hours 1. (a) (i) (b) (iv) (c) (i) (d) (iii)
Practice time 9B 2. (a) Profit of `9.50 (b) Loss of `8.75
1. (a) 540 seconds (b) 774 seconds (c) 12316 seconds (c) Profit of `317
(d) 840 minutes (e) 594 minutes (f) 216 hours (d) Loss of `13.75 3. `175
(g) 211 hours 4. Gain of `64,250
2. (a) 21 minutes 58 seconds (b) 52 minutes 45 seconds
3. (a) 3 hours 58 minutes (b) 8 hours 18 minutes 5. selling Price Profit Loss Cost Price
(c) 17 hours 12 minutes (d) 50 hours 24 minutes (a) `195 – `18 `213
4. (a) 2 days 9 hours (b) 22 days 9 hours (c) 39 days 17 hours (b) `977 `83 – `894
(d) 75 days 10 hours (c) `2980 `105 – `2875
× 3
(d) `8298.25 – `1150.75 `9449
1 h 3 h 7 h 12 h 14 h 16 h 20 h 23 h
(e) `4368 `1486 – `2882
5. × 60 840 min (f) ₹17,672 – `1328 `19,000
60 min 180 min 420 min 720 min 960 min 1200 min 1380 min 6. Profit of `360 7. `2780
Challenge Question (Page 194)
× 3
Practice time 9C `2400
1. (a) (ii) (b) (i) Mental Maths (Page 194)
2. (a) 15 min 44 s (b) 15 h 58 min (c) 6 days 8 hours Cost Price (`) selling Price (`) Profit/Loss Amount (`)
(d) 10 weeks 3 days (e) 8 years 11 months
3. (a) 9 min 12 s (b) 3 min 7 s (c) 15 h 20 min (d) 2 days 8 h 1. `1354 `1005 Loss `349
(e) 1 week 5 days (f) 4 years 3 months 2. `21,350 `23,350 Profit `2000
4. (a) 12:15 a.m. (b) 2:10 a.m. 5. (a) 9:30 a.m. (b) 7:55 a.m. 3. `7224 `6724 Loss `500
6. 7 hours 45 minutes 4. `9702 `10,542 Profit `840
7. (a) 5 hours 45 minutes (b) 8 hours 30 minutes
(c) 14 hours 15 minutes (d) 67 hours 50 minutes Challenge Question (Page 195)
(e) 28 years 7 months `4.50/egg
Practice time 9D Chapter Assessment
1. (a) 111 minutes 36 seconds or 1 hour 51 minutes 36 seconds 1. (a) (iii) (b) (ii) (c) (ii)
(b) 18 hours 15 minutes (c) 48 hours 19 minutes 48 seconds 2. Perfume, purse, earrings or purse, sunglasses, earrings (Answer may
(d) 57 hours 28 minutes 24 seconds vary)
(e) 8 weeks 1 day (f) 21 weeks 3 days 20 hours 3. Loss of `18 4. `25 5. `14,500 6. `499
2. (a) 5 minutes 16 seconds (b) 4 hours 8 minutes 7. `32,500, `75,000 8. `23,250 9. `450 10. `830
(c) 4 hours 9 minutes 6 seconds 11. Profit of `120
(d) 13 hours 57 minutes 30 seconds (e) 9 months 19 days
3. 8 min 59 seconds Chapter 11: Perimeter and Area
Mental Maths (Page 183) Let’s ReCALL
1. (b) 2. (a) 3. (c) 4. (d) 1. (a) 48 cm (b) 14.4 cm (c) 12.4 cm
Chapter Assessment 2. (a) 12 sq. units (b) 8 sq. units (c) 4 sq. units
1. (a) (iv) (b) (ii) (c) (iv) (d) (iii) Challenge Question (Page 202)
2. 21 hours 15 minutes 3. 8 years 3 months 29 days 10 m, 8 m
4. 39 days 5. Sophia, 7 years 10 months and 23 days Practice time 11A
6. 14 minutes 24 seconds
× 3 1. (a) 26 cm (b) 160 cm (c) 14 m (d) 2100 cm or 21 m
2. (a) 24 cm (b) 28 cm (c) 36 m (d) 44 m
1 min 3 min 8 min 15 min 25 min 35 min 3. (a) 15 cm (b) 14 cm (c) 18 cm (d) 42 cm
2 min
7. × 60 4. (a) 18 cm (b) 15 cm (c) 21 cm (d) 30 cm
120 s
60 s 180 s 480 s 900 s 1500 s 2100 s 5. (a) Length Breadth Perimeter of the Rectangle
× 3 (i) 4 cm 7 cm 22 cm
Chapter 10: Money (ii) 5 cm 3 cm 16 cm
Let’s ReCALL (iii) 7 cm 5 cm 24 cm
1. (a) `153.33 (b) `344.34 (c) `11,555.2 (d) `199.99 (iv) 18 cm 12 cm 60 cm
2. `11,450
1
1
Practice time 10A (v) 9 cm 5 cm 30 cm
1. (a) `9 (b) `18 (c) `27 2 2
1
2. `520 3. `32, `60 4. `105 5. `500 (vi) 5 cm 5 cm 21 cm
6. `162 7. `1800 8. `25,20,000 2
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