Answer:
gal --> L --> mL --> g --> lb --> tons
Explanations:
The following for calculating the density is expressed as;
Convert gallons to Litres
1 gallon = 3.785 liters
208,000 gallons = 787280Litres
Convert Litres to mL
Determine the mass
Convert grams to pounds
Convert pounds to tons
Based on the solution above, the correct map that outline the steps to find the weight of the water in a filled swimming pool in tons is gal --> L --> mL --> g --> lb --> tons