4 shepherds were watching over their flocks and they were commenting on how many sheep they each had.
- If David had three more sheep, then he'd have one less sheep than Harry.
- Whereas Sam has the same number as the other three shepherds put together.
- If Peter had three less sheep, he'd have exactly treble the number of David.
- If they were evenly distributed they'd each have eleven sheep.
How many sheep did David have?