The problem:(adsbygoogle = window.adsbygoogle || []).push({});

A large tank is partially filled with 100 gallons of fluid in which 10 pounds of salt is dissolved. Brine containing .5 pounds of salt per gallon is pumped into the tank at a rate of 6 gal/min. The well mixed solution is then pumped out at a rate of 4 gal/min. Find the number of pounds of salt in the tank after 30 minutes.

I've tried this problem 4 times and before I try it again, I want to varifie that I'm setting it correctly.

A=pounds of salt

t=time in minutes

[tex]\frac{dA}{dt}=3-\frac{4A}{100+2t}[/tex]

Does this look right?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Am I setting this diff eq up correctly?

**Physics Forums | Science Articles, Homework Help, Discussion**