# 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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## Age Of Three Daughters Riddles

Hint:
3, 3, and 8. The only groups of 3 factors of 72 to have non-unique sums are 2 6 6 and 3 3 8 (with a sum of 14). The rest have unique sums:

2 + 2 + 18 = 22
2 + 3 + 12 = 18
2 + 4 + 9 = 15
3 + 4 + 6 = 13

The house number alone would have identified any of these groups. Since more information was required, we know the sum left the answer unknown. The presence of a single oldest child eliminates 2 6 6, leaving 3 3 8 as the only possible answer.
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Solved: 38%

## The Number Four Be Half Of Five Riddle

Hint:
IV, the Roman numeral for four, which is “half” (two letters) of the word five.
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Solved: 39%

## Bus Driver Riddle

Hint:
You are.
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Solved: 78%

## Pearl Problems Riddle

Hint: If you took out 2 pearls, you would have about a 50% chance of getting 2 gold bars. However, you can take even more pearls and still retain the 50% chance.
Take out 5000 pearls. If the remaining pearl is white, then you've won 5000 gold bars!
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## Coconut Toll Booth Riddle

Hint:
1 10
2 10
3 9
4 9
5 9
6 8
7 8
8 7
9 7
10 7

200-84 = 116
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Solved: 50%

## Going To The Picnic

Hint:
2 people.

It is stated clearly that Mr. and Mrs. Smith went for a picnic. It does not say that the others accompanied them.
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Solved: 64%

## The Weight Of A Melon Riddle

Hint: We are to determine X the total mass of melon after the drying. The Dry weight, DW is 1lb both before and after the drying. The New Water weight, WNW is clearly X - DW or X - 1
50 lbs.
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Hint:
The best answer from the choices is the owner lost \$100. The \$100 bill that was stolen was then given back to the owner. What the owner loses is the \$70 worth of goods and the \$30 in change, which makes for a total of \$70 + \$30 = \$100. The owner has lost \$100.

Technically, the owner lost \$30 plus the value, V, of the \$70 of goods. Since stores typically sell goods at a markup, the value may be less than \$70. But in the case of a loss leader, the owner may have lost more than \$70.
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Solved: 68%

## Prince Age Riddle

Hint:
Current Future Past

Princess x 2z (x+y)/2
Prince y x z

I then created three equations, since the difference in their age will always be the same.

d = the difference in ages

x y = d
2z x = d
x/2 + y/2 z = d

I then created a matrix and solved it using row reduction.

x y z

1 -1 0 d
-1 0 2 d
.5 .5 -1 d

It reduced to:

x y z

1 0 0 4d
0 1 0 3d
0 0 1 5d/2

This means that you can pick any difference you want (an even one presumably because you want integer ages).

Princess age: 4d
Prince age: 3d

Ages that work

Princess:
4
8
16
24
32
40
48
56
64
72
80

Prince:
3
6
12
18
24
30
36
42
48
54
60
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Solved: 30%

## 2 4 12 48 240 Riddle

Hint:
240. To get the number, multiply the previous number in the series by its position. 48 is in the 5th position, so 48 � 5 = 240
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Solved: 74%

## Missing Dollar Riddle

Hint: Make a list of all of the people involved and how much money they ended up with/spent.
The \$9 paid by each guest accounts for the \$2 that went to the bellhop. So rather than adding \$27 to the \$2 kept by the bellhop, the \$27 accounts for the bellhops money. The \$27 plus the \$3 kept by the guests does add up to \$30.
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## Carton Of Eggs Riddle

Hint:
5 eggs are taken by the first 5 people, then the 6th person takes the egg , while its still in the carton!!
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Solved: 46%

## Finding The Angles

Hint:
47

Explanation:
At first look, it seems pretty easy but on the contrary, it is pretty tricky a question. So let us simplify it by dividing the triangle into three equal triangles (the triangles so formed if outer side is connected to the center of the circle) and then count the number of triangles in each part by taking two or more parts together.

First, let us take the triangles in one part. There are 4 non-overlapping and 3 overlapping triangles.
4 + 3 = 7
7 * 3 = 21

Next, if we take number of triangles by taking two parts together, there are 8 in total.
8 * 3 = 24

Lastly, the number of triangles if all three parts are taken together, there are a total of 2.

21 + 24 + 2 = 47.
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## Finding The Value Riddle

Hint:
Horse = 10
Cowboy-Boot = 1
HorseShoe= 2
The Last equation = 21

Detailed Explanation :
Equation1:
3Horse = 30
=> Horse = 10 .....(1)

Equation2:
1Horse + 2HorseShoe + 2HorseShoe = 18
10 + 4HorseShoe =18
HorseShoe = 2 .....(3)

Equation3:
2HorseShoe - 2Cowboy-Boot = 2
4 - 2Cowboy-Boot = 2
=> Cowboy-Boot = 1 ... (2)

Equation4:
Cowboy-Boot+Horse*HorseShoe = 1+10*2
=>21
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Solved: 62%

## Joe's 10 Coins Riddle

Hint:
A half-dollar, a quarter, four dimes, and four pennies.
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Solved: 41%

## Post Your Math Brain Teasers Puns 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.

1. Why did the math book look sad? Because it had too many problems.

2. Why did the math teacher break up with the geography teacher? They were in different planes.

3. What kind of music do math teachers listen to? Alge-brahms.

4. What did one math book say to the other? Don't bother me, I've got my own problems.

5. How many mathematicians does it take to change a light bulb? None. It's left to the reader as an exercise.

6. Why did the math teacher go to the beach? To test the waters.

7. Why did the student bring a ladder to math class? To help with the high, exponents.

8. Why don't math teachers tell jokes? Because they always fall flat.

9. What did the circle say to the tangent line? Stop touching me!

10. What do you call it when you take a calculator to a party? A math function.

11. Why did the student eat his math homework? Because the teacher told him it was a piece of cake.

12. What's a math teacher's favorite movie? Pi.

13. Why was the math book sad? Because it had too many problems to solve.

14. Why was the math book always unhappy? Because it had too many pages and no cover

15. What does a math teacher say when chasing a thief stealing a couple of books? "Stop, you're confusing the issues!"

16. Why do mathematicians hate the numbers 6 and 28? Because they are perfect numbers, and nothing in math is perfect.

17. Did you hear about the math professor who's afraid of negative numbers? He'll stop at nothing to avoid them.

18. What do you call a numbers addict? A Numeraholic.

19. Why did the math teacher break up with her boyfriend? He was too irrational.

20. Why was six afraid of seven? Because seven eight nine!

21. Why was the math book unhappy? Because it had too many problems to solve.

22. What does the number 7 like to talk about? Himself! He's always got something prime to say.

23. Why is 6 afraid of 7? Cause seven eight nine!

24. How do mathematicians keep warm in winter? They put their hands in their pocket and feel for the roots.

25. What did the number 0 say to the number 8? Nice belt!

26. What do you call a number that just can't stay in one place? A wandering numeral.

27. What did the math book say to the student? I've got problems.

28. Why do math teachers love geometry students? Because they always have their angles covered.

29. What does the number 2 say after a workout? I'm two-tally awesome!

30. Why did the math book ask for a new page? It couldn't stop calculating.

31. What does a math teacher call a parrot? A polynomial.

32. How can you tell if a math book is sick? It has a measuring fever.

33. Why did the math teacher divorce the science teacher? The constant arguing over significant digits.

34. What do you get when you cross a math teacher and a clock? Time tables.

35. What do math teachers serve for dessert? Pi ala mode.

36. Why did the math teacher always carry a calculator? To make multiply plans.

37. What does the mathematician say when arriving at the airport? Square root of my destination, please!

38. What did the math teacher say to the difficult student? You're eXcellent!

39. Why did the mathematician retire to Hawaii? To work on his tanGent.

40. Why did the chicken prefer to do math? Because pecking order is a strategy.

41. What makes math so rich? All the Numbers in the bank.

42. What did the number 9 say to 5 when asked if he was even or odd? "I'm odd."

43. Why did the students fall asleep in math? Because it was a snooze X's exercise.

44. What's the difference between a math teacher and a train? One calculates figures and the other figures calculations.

45. What makes math the cutest? It's the Square Roots.

46. Why was the geometry book sad? Because it had too many problems.

47. What does one math book say to the other math book? I'll meet you at the Calculus.

48. Why was the math book sad? Because it had too many logarithms.

49. Why did the calculus student skip class? He wanted to get an INTEGRAL education.

50. What do you call the worst kind of math student? A sine-er.