Subtracting the initial amount of water from the amount used, the remaining amount of water is given by:
1.) 3.075 gallons.
To find the remaining amount of water in the barrel, we have to subtract the initial amount by the amount used.
We have that:
Hence the remaining amount is:
15 - 11.925 = 3.075 gallons.
Which means that option 1 is correct.
More can be learned about the subtraction between two amounts at https://brainly.com/question/17301989
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