At a service station, the gasoline tank lasts 5 days if 1,400 gallons are sold per day. I explain in two different ways how many gallons per day must be sold for the tank to last 7 days.

Step 1: Let the total capacity of the gasoline tank be denoted as \(C\). Since 1,400 gallons per day allow the tank to last 5 days, we can write: C = 1400 \times 5 = 7000 gallons. Step 2: To find out how many gallons per day \(x\) can be sold for the tank to last 7 days, we set up the equation: 7x = 7000 . Step 3: Solving for \(x\) gives: x = \frac{7000}{7} = 1000 gallons per day.