Answer:

Step-by-step explanation:
Kevin already has five and a half gallons of water for the trip
He knows he needs at least 20 gallons of water for the trip.
The water comes in 32-fluid ounce (quarter-gallon) containers.
1 fluid ounce =0.0078125 gallons
32-fluid ounce 
Let x be the number 32-fluid ounce (quarter-gallon) containers required to have at least 20 gallons of water for the trip.
1 container contains 0.25 gallons of water
So, x container contains 0.25x gallons of water
So, Kelvin has total gallons of water =
Since we are given that He knows he needs at least 20 gallons of water for the trip.
So, 
Hence the algebraic inequality represents this situation is 