It would 15.6251865115 times the volume of the soft ball. Rounded would be 15.625 times the volume.
Step-by-step explanation:
Use the formula 4/3πr cubed. 2 cubes is 8. 8pi is 25.1327412287. 25.1327412287*4/3 is 33.5103216383 rounded would be 33.5. Do the same thing for the radius as 5 and you would get 523.6. i divided 523.6 by 33.5 and you would get around 15.625.