Page 221 - Maths Class 05

Practice 7.3
1. Do it yourself. 2. a. 1 hour 50 seconds b. 8 minutes 10 seconds c. 4 hours 22 minutes
d. 2 hours 15 minutes 3. a. 7 min. 15 sec. b. 6 hr. 25 min. c. 1 hr. 15 min. 5 sec. d. 3 hr. 27 min. 50 sec.
Practice 7.4
1. 9 hours 2. 7 : 00 p.m. 3. 42 seconds 4. 30 minutes 5. Suraj 6. Khanak by 60 seconds
Practice 7.5
1. 45 min 2. 2 h 10 min 3. 10 h 30 min 4. At 7 : 25 5. 11 : 50 a.m., Tuesday 6. 2 h 28 min
7. 3 h 5 min 8. 11 h 5 min 9. 2 h 13 min
Practice 7.6
1. 1 week 4 days 2. 25 years 4 months 3. 10 years 3 months 4. 21 years 10 months
Sum Up
5
1. a. i b. i 2. 23 : 45 hours 3. 4. 16 hours 8 minutes 5. 6 hours 45 minutes
6
6. 7 h 25 min 7. 3 years 5 months
Chapter-8 Making Bills
Practice 8
1. ` 378 + ` 150 + ` 120 = ` 648 2. ` 114 + ` 105 + ` 205 + ` 80 = ` 504
3. The amount of the bill is correct.
4. Date : 10 – 03 – 2019
Name of the customer : Naina Malhotra
Bill No : 435
S.No. Description Quantity Cost per unit Total cost (in `)

1. Watches 2 ` 360 ` 720
2. T-shirts 4 ` 395 ` 1580
3. Shirts 2 ` 199 ` 398
Trousers 3 ` 450 ` 1350
4.
Total ` 4048

5. ` 1262.50 6. Cost of 8 files at ` 20.20 per file = ` 20.20 × 8 = ` 161.60
So, cost of 8 files should be ` 161.60 instead of ` 17.60
And the total cost should be ` 248.80 instead of ` 104.80

7.
Ronit’s bill Maria’s bill
Items Amount (in `) Items Amount (in `)

Fan ` 19 Watermelon ` 17
Bag ` 20 Candle ` 8
Ronit’s bill is more.
Ball ` 90 Toy car ` 65
By ` 9
Bowl ` 23 Carrom ` 53

Total ` 152 Total ` 143

Chapter-9 The Unitary Method
Practice 9.1
1. a. ` 5890 b. ` 3320 c. ` 1690 d. ` 2750 e. ` 990 2. a. ` 109 Profit b. ` 18 Loss
c. ` 150 Profit d. ` 4020 Profit e. ` 354 Profit f. ` 1900 Profit g. ` 1030 Profit
3. ` 3450 4. ` 530 5. ` 3225 6. ` 15 Profit
Practice 9.2
1. Profit 25 % 2. Loss 3.33 % 3. Net profit 9 % 4. Profit 8 % 5. Increase in market price is 50 %
Sum Up
1. a. i b. ii 2. 414 packs 3. 129 days 4. a. ` 35694 b. ` 73200
c. She have to pay ` 501 d. ` 5 would be returned to him e. ` 21500

Mathematics-5 221