12 F in a M TLetter Equations are well known phrases or facts where the key words have been replaced with the first letter of that word. These are often in the form of an equation, which contain a number, an = sign and the rest of the obscured phrase or fact.
12 F (2 F) in a M T
Answer12 Feet (2 Fathoms) in a Mark Twain
A Mark Twain was an old nautical term used to measure the depth of water. They measured the depth by dropping a rope, marked at 2, 3, 5, 7, 10, 13, 15, 17, 20, 25, 30, 35, and 40 fathoms. If the water went to the second mark, it was a "mark twain", twain meaning two.
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