Explanation
The surface areas are in ratio 81:144
Apply the square root to both parts to get the ratio 9:12. This ratio reduces to 3:4 when dividing both parts by the GCF 3.
The side lengths in ratio 3:4 means any of the following possibilities
Anyways let's return back to the ratio 3:4
To get the volume ratio, we cube both parts to go from 3:4 to 27:64