DAY 463

Credit: Tyler  Lipscomb
NPR Weekend Edition Sunday Puzzle
August 25, 2019
Presented by Will Shortz

If:
5 = 4
6 = 9
7 = 5
What does 12 = ?

Answer:

12 = 55

When the numbers are spelled out, they contain Roman numerals:

5 = FIVE - Roman numeral IV (4)
6 = SIX - Roman numeral IX (9)
7 = SEVEN - Roman numeral V (5)
12 = TWELVE - Roman numeral LV (55) 

DAY 462

Q. What is the Golden Rule of submarine service?

A. Count the number of times we dive, add the number of times we surface. Divide by two. If there's a remainder of one, don't open the hatch.