Platypus Body Form I Need Help With Ratios :/?

I need help with Ratios :/? - platypus body form

Daine is the finishing of a diagram showing the body length of 3 Mammels different.

Mammel BODY / LENGTH
Platypus?
Ocelot 36
Echidna 24

The ratio of the length of the platypus, the length of the echidna is 5 to 6 Daine What should use to replace the question mark in the box?

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Can someone help me with this issue?
Not only did I answer, I know how to do it too. Very important test Monday: /