Marbles Where'd they go? All gone.

Marbles Where'd they go? All gone. Eventually went to the math. Listen carefully and try and say cabbage problem!

Value of ?

Hint

Right to left, counting beads, made ​​in the form of beads is to obtain. Wed Square a line from the lot line and divide by subtracting the two. Eh I'm not answering. If you do not like the complicated mathematics. Beads was gone.