Start with three guys with ten each = 30
minus 25 for the TV (30-25=5)
minus two for the shopkeep (30-25-2=3)
and each guy has one at the end (1+1+1=30-25-2=3)

. . . accounting for all of the money

NOT Start with three guys with ten each = 30
They pay 30, but get five back (30-25=5)
then they give the shopkeep two and split the remaining three so that they have 27 and shopkeep has 2 (=29 not 30)

The deal starts with 30 and at the end the guys each have one (=3) and the shopkeep has 27 (25 for the TV and 2 for the tip)





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