Question

How many US gallons of fuel will a tank 66 in three-quarter inch by 132" x 10" whole

Answer 1

Not only does your subject make no sense, your question also is meaningless.

Please proofread, correct, and repost.

Answer 2

Just figure the tank's volume (66.75*132*10) and divide it by 231 in^3, the volume of a gallon.

Answer 3

just a note: that's mu sub-k, not "muse of k"

µ_{_k}