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Question

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If A : B = 2 : 3 and B : C = 4 : 5, then C : A = ?

(a) 15 : 8
(b) 6 : 5
(c) 8 : 5
(d) 8 : 15

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Solution

(a) 15 : 8

AB= 23BC= 45Then, AB×BC = 23×45= 815Hence, C : A = 15 : 8

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