There are 3 buckets which spaces are 13, 7, 19 liters. The 13 and 7 liters's buckets are filled with milk. and 19' is empty. So you have to count 10 liters in any bucket without any equipment.

• 
  19 liters--13 liters-- 7 liters
  0--13--7
  7--13--0
  19--1--0
  12--1--7
  12--8--0
  5--8--7
  5--13--2
  18--0--2
  18--2--0
  11--2--7
  11--9--0
  4--9--7
  4--13--3
  17--0--3
  17--3--0
  10--3--7
  10--10--0
  
• 10 years agoHelpfull: Yes(4) No(0)