(7 gallons, 2 quarts, 1 pint, 1 cup, 6 ounces) x 2

15 gallons, 1 quart, 1 pint, 1 cup, 4 ounces

Explanation:

8 ounces = 1 cup

2 cups = 1 pint

2 pints = 1 quart

4 quarts = 1 gallon

(7 gallons, 2 quarts, 1 pint, 1 cup, 6 ounces) x 2

Multiply all the measurements by 2: 14 gallons, 4 quarts, 2 pints, 2 cups, 12 ounces

Convert the ounces into cups: 14 gallons, 4 quarts, 2 pints, 3 cups, 4 ounces

Convert the cups into pints: 14 gallons, 4 quarts, 3 pints, 1 cup, 4 ounces

Convert the pints into quarts: 14 gallons, 5 quarts, 1 pint, 1 cup, 4 ounces

Convert the quarts into gallons: 15 gallons, 1 quart, 1 pint, 1 cup, 4 ounces

I hope this helps