Algebra-1

To determine how much water is in the tank before it starts being filled, we can set up an equation.

Let x be the amount of water in the tank before it starts being filled.

We know that water is being added at a rate of 6 gallons per minute, and this continues for 5 minutes. The total amount of water added in 5 minutes is: 6 gallons/minute × 5 minutes

After 5 minutes, the total amount of water in the tank is 80 gallons. So, the initial amount of water plus the added water equals 80 gallons.