Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. This is a huge parts of our final standing and I really have to understand this. Thank you! Notes! - Do not forget to include proper...

Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE.




This is a huge parts of our final standing and I really have to understand this. Thank you!

Notes!
- Do not forget to include
proper units
in solving.
- Show
complete step-by-step solution, fully indicating
boundary conditions
and
equations
used.

[Problem]

A 200-gallon tank initially holds 50 gallons of salt solution containing 20 lbs dissolved salt. A pipe fills the tank with 2 lbs of salt per gallon at a rate of 5 gpm. The mixture is stirred uniformly and 3 gpm of brine runs out of the tank.

a. Draw the schematic diagram of the system showing the values given in the problem.
b. Determine the amount of salt in the tank at the end of 85 minutes.