You mix 245.0 gallons of a mixture containing 4.00 wt% nacl (sodium chloride) and 96.00 wt% water (solution density = 1.0253 g/cm3) with a v2-gallon solution that is 20.00 wt% nacl and 80.00 wt% water (solution density = 1.1453 g/cm3). you want to produce a mixture containing 19.00 wt% nacl. what is v2 in gallons?