V = 1000
Put the sides together: 4/6
Cube the sides (for volume you cube): 64/216
Then put the volume across from the side that has that volume: 64 x
----- = -----
216 3375
Cross multiply.
It should then equal this: 216x=216000
Divide by 216 and then you find x, which in other words the volume
x = 1000