answer using DE

Brine from a first tank runs into a second tank at 2 gpm and brine from the second tank runs into the first at 1 gpm. Initially there are 10 gallons of brine containing 20 lb of salt in the first tank and 10 gal of fresh water in the second tank. How much salt will there be in the first tank after 5 minutes? Xsalt 20 lbs salt 10 as to V-10tit-t V = 10-t 1/ = 10t2t-it 12 = lott 10 bal 28pm