Answer:
<em>The variation is </em><em>joint variation.</em>
Step-by-step explanation:
The given equation is,
where
c is the proportionality constant.
So,
This can be segregated as,
and
Therefore, I is in direct variation with m and n separately. But as both variations are of same type, so I is in joint variation with m and n.
1679616
36^4
20]x]
About 15 gallons.