# MATH BRAIN TEASERS

### Fun Facts (Hints)

Mathematics has an extensive history in just about every culture or civilized society known to man. Listed below are some cool facts to get those math juices flowing:
• In 1852 mathematician JJ Sylvester established the "theory of algebraic invariants."
• In 1995 math great Andrew Wiles, proved "Fermat's Last Theorem."
• The first decimal number system is said to have been invented in Ancient Egypt around 5000BC.
• The Ancient Mayan civilization located in Central America is one of the only cultures in the recorded history of the world to use a place-value number system.
• The American Mathematical Society was formed in the late months of 1888 in New York.
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## Farmer Stones Riddle

Hint:
The stones weight 1 pound, 3 pounds, 9 pounds and 27 pounds. These can be used in combination with each other on both sides of the scale to come up with any counterweight from 1 to 40 pounds.
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Solved: 40%

## A Farmers Sheep Riddle

Hint:
9
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Solved: 80%

## How Many Chocolates Can You Get?

Hint:
15 chocolates with resale. 15 then with 15 wrappers you get 5 more chocolates. With 3 wrappers from the 5 new chocolates you get 1 more chocolate. And with these 1 more wrapper and the remaining 2 wrappers you get 1 more chocolate. Hence you get total 15 + 5 + 1 + 1 = 22
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Solved: 61%

## The Jacksons Wedding Day Riddle

Hint:
Mr. Jackson was 54 and his wife was 18. Now hes 72 and his wife 36.
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Solved: 47%

## Two Girls On A Train

Hint:
If the girls had been on a standing train, the first girl's calculations would have been correct, but their train was moving. It took 5 minutes to meet a second train, but then it took the second train 5 more minutes to reach where the girls met the first train. So the time between trains is 10 minutes, not 5, and only 6 trains per hour arrive in the city.
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Solved: 55%

## Outrunning A Train Riddle

Hint:
The train is moving at 40 miles per hour. Imagine that a friend is walking with you. When the train whistle blows, you head away from the train, he heads toward it. When he reaches safety, you will be 6/8 (or 3/4)of the way across the bridge, and the train will have just reached the bridge. For the train to cross 4/4 of the bridge in the time you cross the remaining 1/4, the train must be moving four times your speed.
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Solved: 34%

## Three Sides And Three Angles

Hint:
I am a Triangle.
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Solved: 93%

## Brothers And Sisters Riddle

Hint:
Four daughters and three sons. Each daughter has 3 sisters and 3 brothers, and each brother has 2 brothers and 4 sisters.

To figure it out mathematically, you could use the following two equations where G = the number of girls and B = the number of boys:
G 1 = B
2(B 1) = G

Solving for G gives you 4 and plugging that in to G 1 = B gives you a B of 3.
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Solved: 57%

## The Magic Number Riddle

Hint:

If you got a different number you did the math wrong
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Solved: 77%

## Owls And Wolves Riddle

Hint:
5 owls and 5 wolves, (not 6 owls because 2 of the eyes and legs are yours).

2 * owls + 2 * wolves = 20 eyes
2 * owls + 4 * wolves = 30 legs
owls + wolves = 10 eyes owls = 10 wolves
owls + 2 * wolves = 15 10 wolves + 2 * wolves = 15 wolves = 5
owls + 5 = 10 owls = 5
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Solved: 59%

## Lakes And Boats Riddle

Hint:
When the boats meet for the first time, they have sailed a combined distance that is equal to one length of the lake. When they meet the second time, they have sailed 3 lengths. The elapsed time and the distance for each is three times.

When they meet for the second time, the boat M has sailed 500 x 3 = 1500 yards. Now, this is 300 yards longer than the length of the lake, it must be 1200 yards wide.

The ration between the speed of boat M and boat N is equal to the ratio of the distance that they have sailed before they meet the first time.
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Solved: 100%

## Sand Piles Riddle

Hint:
One big pile.
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Solved: 66%

## Eight Balls

Hint:
Put three balls on each side of the scale. If the arms are equal, you know the heavy ball is one of the two remaining. If the arms are unequal, take the three balls on the heavier side, pick two and weigh them against each other.
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Solved: 42%

## I Am 3+3

Hint:
6.
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Solved: 96%

## Post Your Math Brain Teasers Below

Can you come up with a cool, funny or clever Math Brain Teasers of your own? Post it below (without the answer) to see if you can stump our users.