I am not really sure how to get right values for variables/constants: A tank contains 100 gallons of salt water which contains 10 lbs of salt. A salt solution of 2 lbs salt per gallon enters the tank at a rate of 3 gallons perminute while a flow of fresh water runs into the tank at rate 5 gallons per minute. The well-stirred solution runs out of the tank at rate of 7 gall/min. Let A(t) be the amount of salt in lbs at time t in mins. The initial value problem for A(t) is ... (to be found as a DE with IC). V(0) = 100 r2(flow rate) = 7 gall/min A(0) = 10 gal. The underlined section is where I need some help, at least then I can start on the problem and see how I end up. Thanks in advance.