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.

DAY 461

From Reader's Digest
Jean-Claude Baillif
From "SUPERPUZZLES"

A water lily on a lake doubles in size each day. In one month it will cover the entire lake. How much time would it take two such lilies to cover the lake?

Answer:

One month less one day.

DAY 460

Think of any number greater than zero. Multiply by three. Add one. Multiply by three again. Add the original number.
The answer will always end with three. Strike off the three, and the remaining figure will be the original number.

DAY 459

From Reader's Digest
Contributed by L.S. Bowen


Before sailing as a guest on board a submarine, I asked the coxswain if there were any special  regulations to be observed during exercises. I was puzzled when he asked me how good my mental arithmetic was. He went on to explain the golden rule of the submarine service: "Count how many times we dive, add the number of times we surface, divide by two. If there is a remainder of 1, don't open the hatch."

DAY 458

How do you equally divide three oranges among four people?

Answer:

Each person gets 3/4 of an orange. Cut each orange into quarters and give each person three.

DAY 457

Matchstick Puzzle

The equation below in Roman numerals (9-12 = 3) is obviously wrong. Move one line (matchstick) to produce a correct equation. (The solution does not involve an inequality sign, negative numbers, or changing an X to a V.)

IX - XII = III

HINT:
There are 13 lines in the equation.

Answer:

IX = XII - III