Answer:
Mark's Tub is the biggest out of them all at 20 gallons.
Explanation:
First, Let's calculate everything into Gallons.
We already know that Jason and Mark's capacities don't need calculations.
Louis's 30 quarts can be calculated to 7.50 Gallons.
Jamie's 50 pints can be calculated to 6.25 Gallons.
Conclusion:
Jason's Tub is the least at 2 gallons.
Jamie's Tub is more than Jason's at 6.25 gallons
Louis's Tub is more than Jamie's at 7.50 gallons.
Mark's Tub is the biggest out of them all at 20 gallons.