Mixing problems occur quite frequently in chemical industry. we explain here hov. to solve the basic model
involving a single tank. the tank in fig. i) contains 1000 gal of water in which initially 100 ib of salt is dissolvcd.
brine runs in at a rate of 10 gal/min. and each gallon contains 51b of dissoved salt. the mixture in the tank is
kept uniform by ~tirring. brine ['uns our at 10 gal/min. find the amount of salt in the tank at any time t.