A 300 gallon tank is filled with 100 gallons of water in which 10 pounds of salt is dissolved. Avalve is opened above the tank and water containing 2 pound of salt per gallon flows into the tank at a rateof 3 gal/min. Simultaneously, a drain is opened at the bottom of the tank allowing the solution to leave thetank at a rate of 1 gal/min.(a) Write down the initial-value problem that models the amount of salt in the tank.(b