Answer:
6.2 gallons of teaaaa
Explanation:
first you are going to take the initial amount of tea that you had in the beginning which was 16.5
second you are going to subtract the 3.4 gallons that were served int the first hour, which will leave you with 13.1 gallons of tea
next you subtract the other 6.9 gallons served in the second hour, leaving you with 6.2 gallons of tea
so 6.2 is what you would have left after the second hour :)