87 YearsLetter 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.
272 = W in A L's G A
Answer272 = Words in Abraham Lincoln's Gettysburg Address
The title refers to the opening line of the speech, "Four score and seven years ago".
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