Answer:
They drank 75 gallons of water.
Explanation:
We know that the entire cooler of water can be filled with 50-gallon of water.
We know that the football team drank an entire cooler and half as much again.
If ''V'' is the volume of the cooler we can write this mathematically as :

The equation expresses that the team drank 1.5 times the total capacity of the cooler ⇒ Multiplying 1.5 by the total capacity of the cooler we will obtain the total gallons of water that the football team drank :

The football team drank 75 gallons of water.