Answered You can hire a professional tutor to get the answer.
At t=0 minutes, the valves a, b are opened and a brine solution with concentration 2 lb/gal is pumped into the tank through a at the rate of 1 gal/min, and drained through valve b at the same rate. in
At t=0 minutes, the valves a, b are opened and a brine solution with concentration 2 lb/gal is pumped into the tank through a at the rate of 1 gal/min, and drained through valve b at the same rate. initially, there was 20 gallons of brine with concentration 12 lb/gal in the tank. {"version":"1.1","math":"\text{at $t=0$ minutes, the valves a, b are opened and a brine solution $\\$with concentration 2 lb/gal is pumped into the tank through a at $\\$the rate of 1 gal/min, and drained through valve b at the same rate.$\\$initially, there was 20 gallons of brine with concentration $\frac{1}{2}$ lb/gal $\\$in the tank.}"} question 4
