Math

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The five school children in couples weigh 129 pounds, 125 pounds, 124 pounds, 123 pounds, 122 pounds, 121 pounds, 120 pound, 118 pounds, 116 pounds and 114 pounds on a weighing machine.
What was the weight of each one of the five children if taken separately?
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The circumference of the Earth is approximately 40,000 kilometers, and someone has just made a metal band that circles the Earth, touching the ground at all locations.
You come along at night, as a practical joke, and add just 10 meters to its length (one hundredth of one kilometer !)
It is now one fourmillionth longer, and sits magically just above the ground at all locations
How far has it risen … could a flea, a rabbit or even a man squeeze underneath it?
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The cold faucet in a bath lets the water in at the rate of 15 litres per minute.
The hot faucet fills the bath at the rate of 10 liters per minute.
The plug hole lets the water out of the bath at the rate of 12 liters per minute.The bath holds a maximum of 520 liters.
I turn both faucets on, but forget to put the plug in. How many minutes does it take for the bath to overflow?
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Peasant John wants to buy new chickens, pigs, and horses. A new chicken costs 50 euro cents, a pig 3 euros, and a horse 10 euros. Peasant John has 100 euros with which he wants to buy exactly 100 animals, but in such a way, that she has at least one of each kind of animal.
How many animals must peasant John buy of each kind?
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Calculate below as fast as you can, using only mental arithmetic (Without pen, paper, or a calculator!).
Take 1000 and add 40.
Add 1000.
Add 30 and then add 1000.
Add 20.
Add 1000 and then add 10.What is the result of this calculation?
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Three men in a cafe order a meal, the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognizes the three as friends and asks the waiter to return $5 to the men.
The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.
Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14…..where has the other $1 gone from the original $15?
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