there is a problem similar to this before, one two week before
its a problem of debit and credit
debit -- are the amount they received
credit -- are the amount they give
. . . . . . . d e b i t . . . . . . . . . . . . . . c r e d i t . . . .
food . . . . .75 . . . . . . . . . . . . paid 75
received . 3 . . . . . . . . . . . . . . . . . . . . remove 5
pocketed .. 2 . . . . . . . . . . . .
sum . . . ====== . . . . . . . . . . . . ==========
. . . . . . 80 . . . . . . . . . . . . . . . . 80
the amount taken in by the 3 person is 80
the amount that was taken from therm is 80
still it is balanced
75 - 5 = 70 is the total amount they paid