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

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$12 : 16 : 15$

$12 : 15 : 20$

$3 : 16 : 5$

$3 : 4 : 5$

answer is B.

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$A : B = 3 : 4 and B : C = 4 : 5$

$B : C = 4 : 5$

$A : B : C = 3 : 4 : 5$

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