Ratio, Proportion
- Out of the ratio 7 : 15, 15 : 23, 17 : 25 and 21 : 29 the smallest one is ?
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7 : 5 = 7/15 = 0.466
15 : 23 = 15/23 = 0.652
17 : 25 = 17/25 = 0.68
and 21 : 29 = 0.724Correct Option: B
7 : 5 = 7/15 = 0.466
15 : 23 = 15/23 = 0.652
17 : 25 = 17/25 = 0.68
and 21 : 29 = 0.724
∴ The smallest one is 7 : 15.
- If 1/5 : 1/N = 1/N : 1/1.25, then the value of N is ?
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Given 1/5 : 1/N = 1/N : 1/1.25
⇒ 1/5 x 1/1.25 = 1/N x 1/N
⇒ N2 = 5 x 1.25 = 6.25
∴ N = 2.5Correct Option: C
Given 1/5 : 1/N = 1/N : 1/1.25
⇒ 1/5 x 1/1.25 = 1/N x 1/N
⇒ N2 = 5 x 1.25 = 6.25
∴ N = 2.5
- If one-third of A, one-fourth of B and one-fifth of C are equal, then A : B : C is ?
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∵ 1/3 A = 1/4, B = 1/5, C = x
Then, A = 3x, B = 4x and C = 5x
Correct Option: A
∵ 1/3 A = 1/4, B = 1/5, C = x
Then, A = 3x, B = 4x and C = 5x
∴ A : B : C = 3x : 4x : 5x = 3 : 4 : 5
- The ratio which (1/3 of Rs. 9.30) bears to (0.6 of Rs. 1.55) is ?
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Req. ratio = (1/3 of Rs. 9.30) / (0.6 of Rs. 1.55)
= 3.10 / 0.93Correct Option: B
Req. ratio = (1/3 of Rs. 9.30) / (0.6 of Rs. 1.55)
= 3.10 / 0.93
= 310 / 93
= 10 / 3
- If a : b = 2 : 3 and 2 : a =1 : 2, then the value of 'b' is ?
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∵ a / b = 2/3 and 2 / a = 1/2
⇒ a/b x 2/a = 2/3 x 1/2Correct Option: B
∵ a / b = 2/3 and 2 / a = 1/2
⇒ a/b x 2/a = 2/3 x 1/2
⇒ 2/b = 1/3
∴ b = 6
