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If a : B = 2 : 5 and a : C = 3 : 4, Find A : B : C - ICSE Class 10 - Mathematics

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Question

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

Solution

To compare 3 ratios, the consquent of first ratio and the antecedent of 2nd ratio must be made equal.

Given that A : B = 2.5  and A:C = 3:4

Interchanging the first ratio we have

B : A = 5:2  and A : C= 3 : 4

L.C.M of 2 and 3 is 6

=> B : A = 5 x 3 :  2 x 3  and A : C = 3 x 2 :  4 x 2

=> B : A = 15 : 6 and A : C = 6 : 8

=> B : A : C = 15 : 6 : 8

=> A : B : C = 6 : 15 : 8

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APPEARS IN

 Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Ex.7A | Q: 18.2

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Solution If a : B = 2 : 5 and a : C = 3 : 4, Find A : B : C Concept: Ratios.
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