Page 231 - Maths Skills - 8

Answers 229

Assessment Time

A. 1. (iii) 2. (ii) 3. (ii) 4. (iii) 5. (iii) B. 1. same non-zero number 2. add; subtract 3. one
4. transposition 5. no C. 1. T 2. F 3. F 4. T 5. F D. 1. Rajeev spent ` 80
2. Megha spend `100 3. 5:4 E. 1. (a) 2. (d) F. 1. 15 km/h 2. 40 km/h, 30 km/h 3. men = 180
G. x = 9, y = 7, z = 3, p = 5
HOTS
91 42 140 77
133 84 98 35
1. (iv) 2. 48 3. 9 km 4. 56 105 63 126
70 119 49 112
Chapter - 8: Comparing Quantities

Boot-up
A. 1. (ii) 2. (iii) 3. (iv) B. 1. 25 2. 55 3. Principal 4. 25%
C. 1. T 2. F 3. T 4. F

Exercise - 8.1

1. (i) 400 (ii) 19 (iii) 1200 (iv) 200 2. (i) 39 (ii) 31 : 50 (iii) 0.13 (iv) 5 : 4 3. 36 72 %
50 73
4. B = ` 17200, C = ` 21500 5. 500 6. 83.6% 7. 325 days 8. 18 86 % 9. 200 grams 10. ` 5760 11. 0.25% decrease
123
12. ` 16000 13. 4000 14. ` 12500 15. decrease by 9% 16. ` 19000 17. ` 92118.75 18. ` 224000
19. 80% milk, 20% water 20. (i) 9 (ii) ` 36 (iii) 6 m

Exercise - 8.2
1. (i) ` 2000 (ii) ` 2600 2. (i) ` 807.50 (ii) ` 1426 3. (i) 6.25% (ii) 20% 4. 8% 5. ` 500
6. ` 325 7. ` 136 8. 32.5% 9. 17.2% 10. ` 4500

Exercise - 8.3
1. ` 472.50 2. ` 14560 3. ` 3181.81 4. 10% 5. ` 2000 6. ` 127.20 7. 10%

Exercise - 8.4
1. ` 2496 2. ` 3448.10 3. ` 12900 4. ` 2100 5. Amount = ` 24334, C.I. = ` 8334 6. ` 913.50 7. ` 33275

Exercise - 8.5

1. (i) A = ` 27783, C.I. = ` 3783 (ii) A = ` 10035.20, C.I. = ` 2035.20 (iii) A = ` 25,155.90, C.I. = ` 7155.90
2. ` 41760 3. ` 9987 4. ` 1664 5. A = ` 30561.30, C.I. = ` 6061.30
6. A = ` 21772.80, C.I. = ` 3772.80 7. ` 1023516
Exercise – 8.6

1. A = ` 21057.45, C.I. = ` 3057.45 2. A = ` 14185.19, C.I. = ` 4185.19 3. ` 3902 4. ` 609.06

Exercise - 8.7
1. 36300 2. Total population = 11664, Net increase in population = 1664 3. 926859.375 km
4. Net increment of 12000 cycles 5. ` 68850 6. ` 9000

Assessment Time
A. 1. (iv) 2. (i) 3. (ii) 4. (ii) 5. (ii) 6. (ii) 7. (iii) 8. (iii)