Answer:
-7/8 gallons
Explanation:
You want to know the change in the amount if 1/6 of 5 1/4 gallons evaporated.
Product
The word "of" in this context means "times."
1/6 of 5 1/4 gallons = (1/6)·(21/4) = 21/24 = 7/8
The decrease of 7/8 gallons can be represented by the value -7/8.
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Additional comment
The wording of the problem is unclear as to whether you need the minus sign.
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