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Answers
39. A
40. A
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Answer:
39. (a) 8
40. (c) both a and b
41. -7
42. 5
43. proportional
44. ratio
45. -1
46. 8%
47. P¹⁷
48. 5cm
49. 270°
50. 95°
51. colinear
52. point of intersection
53. 5
54. 28(variable)
55. 3(z+5)
56. 0
57. 1
58. 55,89
59. closure property
60. 1
61. 2,3,5,7,11,13,17,19,23,29
62. 1
63. no
64. 0
65. 0
66. 4:5
67. 3:5
68. 39
69. 75%
Step-by-step explanation:
39. (a) 8
40. (c) both a and b
41. -7
42. 5
43. proportional
44. ratio
45. -1
46. 8%
profit% = profit×100/cp
profit = sp-cp
= 972-900= 72
so,
72×100/900
= 8%
47. P¹⁷
48. 5cm
chord passing through centre is diameter
if d= 10cm
radius = d/2
= 10/2
= 5cm
49. 270°
50. 95°
let the other angle be x
so if it is linear pair
85°+x = 180°
x = 180-85
= 95°
51. colinear
52. point of intersection
53. 5
54. 28(variable)
55. 3(z+5)
56. 0
57. 1
58. 55,89
59. closure property
60. 1
61. 2,3,5,7,11,13,17,19,23,29
62. 1
63. There cannot be two numbers having 16 as their HCF and 380 as their LCM.
Reason:
We know that the product of two numbers is equal to the product of their LCM and HCF.
64. 0
greatest -ve integer = -1
greatest +ve integer = 1
-1+1 = 0
65. 0
66. 4/5
5:8 = 5/8
4:5 = 4/5
( check by cross multiplication)
5:8 -- 5×5 = 25
4:5 -- 8×4 = 32
so, 4:5>5:8
67. 3:5
68. 39
let the number in the box be x
8/12 = 26/x
8×x = 12×26
x = 12×26/8
x = 39
69. 75%
total marks = 80
rahul marks = 60
percentage = 60/80×100
= 75%
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