Mark:
PYRAMIDS
The pyramids will provide nearly 5600km of wall.
Rap:
Pyramids
Ans---Just about
Volume of pyramid
V=1/3bh where b is base area and h is height
Cheops=1/3*146m (230m)^2=2,574,000m^3
Chaperon =1/3*143m (215m)^2=2,203,000m^3
Michelins =1/3*66m (108m)^2=256,000m^3
Vall=(2,574+2,203+256)*1000=5034,000m^3
Wall 3m tall and 0,3M wide TAKES 0.9M^3/Mlength
Wall length is Vall/0.9=5,593,000m=5,593km
France Factoids
Land boundary (Belgium, Germany, Switzerland, Spain, and one of those teeny countries in the Pyrenees) =2893km
Coastline=3427 km
Total 6319km
Can they build a wall around France---Shy about 726km (that's about 430 miles to us ?'Mericans).
Mark, "Wow! My back of the napkin conversion of area to perimeter was off by a factor of 2."
FANTASTIC calculations guys.
Mark, if you abandon the ?'napkin' and return to the abacus you will avoid such errors.
To start with, we have to figure out how much stone is in the Pyramids. Although there is a small amount of open space inside each Pyramid for the Pharaoh and his stuff, this is tiny compared to the overall volume. For this puzzle we can assume the Pyramids to be solid stone.
The formula for the volume of a pyramid is
V = 1/3 * H * Ab
Where V is volume, H is the height of the pyramid and Ab is the area of the base. Starting with Kheops, the square base is 230 meters on a side, so the area is 52,900 square meters. The height is 146 meters. So
V = 1/3 * 146 * 52,900 = 2,574,467 cubic meters
Following the same procedure we find that the volume of Khephren is 2,203,392 cubic meters and the volume of Mykerinos is 256,608 cubic meters. The total volume of the three Pyramids is 5,034,467 cubic meters.
Now let's look at Napoleon's proposed wall. How much stone would be needed to build a section 1 kilometer long? The volume of such a rectangle is Height * Length * Width. The Length is 1 kilometer, or 1,000 meters. The Height is 3 meters and the width is 30 cm, or 0.3 meters. So
V = 1,000 * 3 * 0.3 = 900 cubic meters
Every 900 cubic meters of stone makes a wall 1 kilometer long. Dividing the total volume of the stone in the Pyramids by the amount of stone in a 1 km section gives us the length, in kilometers, of the wall that could be built:
Length of Napoleon's proposed wall around France = 5,034,467 / 900 = 5,594 kilometers. Is that enough to go all the way around the country?
If you draw a square on a map of France 1,000 km on a side. The perimeter is 4,000 km. So we've built a wall around France with 1,594 km of stone wall to spare.
But this is probably not what Napoleon had in mind. What if the wall followed the coastline and the boundaries with neighboring countries? Would there be enough stone for such a wall? We can't answer that because we can't know how long the boundary is. This may seem surprising, but the length of the boundary depends on how big a ruler you use to measure it. The smaller the ruler, the longer the path.
Water:
Rap
Label--Actually nothing. Most liquids are sold in containers based upon liquid weight measure conversions. Say a liter volume weighs 1 kg when filled with water, and a US Gallon is (about) 128 fluid oz (of water).
Mark:
A gallon is a unit of capacity, not weight. The density of the contents will determine the weight.
The liquids in my pantry are labeled by capacity (fluid ounces), not weight.
?'The label says "NET WT. 1 GAL," which is an abbreviation for "Net Weight 1 Gallon." The label is saying that the weight of the water is 1 gallon.
The problem is that the gallon is a unit of volume, not weight.
The gallon is a measure used in the United States. Its metric equivalent is 3.78 liters, which is also on the label.
But the mistake is not completely off the mark. Knowing that you have 1 gallon of water also tells you what it weighs. As the label says, a gallon is equal to 128 fluid ounces. A fluid ounce is a measure of volume, like the gallon. But there is a unit of weight called an "ounce" that is the weight of one fluid ounce of water.
Therefore, the water weighs 128 ounces, or 8 pounds. (There are 16 ounces in a pound).'
1. Why is a crossword puzzle like a quarrel?
.....Because one word leads to another.
2. Why is a bad cold like a great humiliation?
.....Because it brings the proudest man to his sneeze.
3. Why is a schoolboy being paddled like your eye?
.....Because he is a pupil under a lash.
4. What time is it when the clock strikes thirteen?
.....Time to get a new clock.
5. What is black and white and red all over?
.....An embarrassed zebra (not a newspaper which is "READ")
A book has 500 pages numbered 1, 2, 3, and so on. How many times does the digit 1 appear in the page numbers
In three bowling games, Alice scores 139, 143, and 144. What score Will Alice need in a fourth game in order to have an average score of 145 for all four games
P and Q represent numbers, and P * Q means (P+Q)/2 . What is the value of 3 * (6 * 8)
If 1/3 = 1/A + 1/B where A and B are different whole numbers, find the value of A and the value of B
Serious logic riddles:
Two men were drinking in a bar. Two women walked in. The first man said, "I have to go, my wife and daughter are here." The second man turned around and said, "I have to go too, my wife and daughter just arrived as well." How is this possible
Clues: No-one else has walked in apart from these two women. The men are not married to the same woman.
A windowless room has 3 light bulbs. Three switches are outside the room, and each switch operates one of the bulbs inside. If you only enter the room once, how can you determine which bulb is connected to which switch
Why do Chinese men eat more rice than Japanese men
(Yes, this is serious.)
With the two keys they had left, they could unlock only one of the bicycles. Whose bicycle was it 
