12
3 qts
12 qts = 3 gal
3 qts
14 cups
3 qts
3 qts
3 qts
7 gal 1 qts = 7*4 + 1 = 29 qts 2 gal 3 qts = 2*4 + 3 = 11 qts so diff = 29 - 11 = 18 qts = 4 gal 2 qts.
Buy 4 qts but start with 3 qts when refilling.
example: -6 + 3 1. imagine in your head or write ------ and +++ 2. cross out one until u get the answer cs = cross out - - - - - - + + + cs cs cs cs cs cs so there are only 3 negatives left, so the answer is -3
14 cups
12