(v) Reciprocal ratio of
\[3:\text{ }5\text{ }=\text{ }5:\text{ }3\]
(vi) Duplicate ratio of
\[5:\text{ }6\text{ }=\text{ }25:\text{ }36\]
Reciprocal ratio of
\[25:\text{ }42\text{ }=\text{ }42:\text{ }25\]
Sub-duplicate ratio of
\[36:\text{ }49\text{ }=\text{ }6:\text{ }7\]
Required compound ratio =
