12f -9 = 27
12f = 27+9
12f = 36
f = 3
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168
M = 930A = 12F = M A = (930) x (12) = 11,160
A foot is 12 inches. 12f=i. 12f=216. 12f/12=216/12. f=18. So there are 18 feet in 216 inches (assuming you are using the customary system).
This is a ditloid. The answer is 9 = gallons in a firkin.
27