Water tank holds $20,000 how long will it take for the water level to reach 6000 gallons if the water is used at an average rate of 500 gallons per day

Is the $20,000 supposed to be 20,000 gallons?

If so,

20,000-500x=6,000

would be your equation needed to solve this.

Subtract your 20,000 from both sides.

This should leave you with a new equation of

-500x=-14,000

Divide both sides by - 500 to leave a single x variable on one side of the equation. You should be left with a new equation of

x=28

That's it!

It takes 28 days for the water level to reach 6,000.