Maths Equation Riddle

Prove that the below maths equation is true.

8 + 8 = 91




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We have arranged four hats in the below picture to assist you.

Arrange Hats in Squares

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The day before the 1996 U.S. presidential election, the NYT Crossword contained the clue “Lead story in tomorrow’s newspaper,” the puzzle was built so that both electoral outcomes were correct answers, requiring 7 other clues to have dual responses.