Question

If a : b = 3 : 4 and b: C = 5:9, then a : b:cis
(1) 15 : 20 : 36 (2) 20 : 36 : 15
(3) 3 : 20 : 9
(4) None f these

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Answer 1

Answer:

3) 3:20:9

Step-by-step explanation:

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Answer 2

To find a:b:c , b is made same in both the ratios .L.C.M of 4 and 5 is 20.

a:b = 3/4 = 3×5/4×5 = 15/20

b:c = 5/9 = 5×4/9×4 = 20/36

The right answer is (a) 15 : 20 : 36

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