Question : If $A:B=7:9$ and $B:C =3:5$, then $A:B:C$ is equal to:
Option 1: $7:9:5$
Option 2: $21:35:45$
Option 3: $7:9:15$
Option 4: $7:3:15$
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Correct Answer: $7:9:15$
Solution :
Given:
$A:B = 7:9$
Let $A = 7x$ and $B = 9x$
$B:C = 3:5$ or we can say $9:15$ (after multiplying by 3)
Let $B=9x$ and $C=15x$
$A:B: C = 7x:9x:15x$
$\therefore$ $A:B:C = 7:9:15$
Hence, the correct answer is $7:9:15$
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