Question

3:5 , 7:9 and 15:28 find compounded ratio​

Answer 1

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By the defination of compound ratio these ratio can be expressed as :-

$\frac{3}{5} \times \frac{7}{9} \times \frac{15}{28} = \frac{1}{4}$

Hence, the final answer is$\frac{1}{4}$

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Answer 2

$Compound \: \: ratio = \frac{3}{5} \times \frac{7}{9} \times \frac{15}{28} \\ \\ = \frac{1}{4} \\ \\ = 1:4$

I hope this helps you.