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

DAY 456

From Reader's Digest

If it cost one cent to ride 1,000 miles, how much would a trip around the world cost? How much to go to the moon? The sun? And how much would it cost to go to Alpha Centauri, our nearest star other than the sun. Use the following distances to help solve:


Circumference of the Earth: 25,000 miles
Distance to the moon: 240,000 miles
Distance to the sun: 93,000,000 miles
Distance to Alpha Centauri: 26,000,000,000,000 miles
                                             (26 trillion - 4.2 light years)

Answers:

25 cents to go around the Earth
$2.40 to go to the moon
$930 to go to the sun
$260,000,000 to go to Alpha Centauri

Explanation of the math:

Think of the distances as multiplied by 1,000 - to give the number of cents. Then translate the number of cents into dollars by dividing by 100 (if necessary).

Earth - circumference of 25,000 miles - 25 thousands = 25 cents

Moon - 240,000 miles from Earth - 240 thousands = 240 cents = $2.40

Sun - 93,000,000 miles from Earth - 93,000 thousands = 93,000 cents = $930

Alpha Centauri - 26,000,000,000,000 miles from Earth
                              26,000,000,000 thousands
                              26,000,000,000 cents = $260,000,000 

Note from JA: Alpha Centauri's distance at 26 trillion miles can also be expressed as 4.2 light years. 

DAY 455

What do you get if you divide the circumference of your jack-o-lantern by its diameter?

Answer:

Pumpkin pi