Four brothers were comparing the number of sheep that they owned.  It was
found that Claude had ten more sheep than Dan.  If Claude gave a quarter of
his sheep to Ben, then Claude and Adam would together have the same number
as Ben and Dan together.  If then, Adam gave one-third to Ben, and Ben gave a
quarter of what he then held to Claude, who then passed on a fifth of his
holding to Dan, and Ben then divided one-quarter of the number he possessed
equally amongst Adam, Claude, and Dan, they would all have an equal number
of sheep.  How many sheep did each son possess?