Brain Teaser posted by Rosala (25/5/14)

http://web2.0calc.com/questions/brain-teaser_1

Puzzle posted by NinjaDevo (5/6/14)

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Answer is here.   

http://web2.0calc.com/questions/math-puzzle_1

I can't edit pages from the old forum so I'll start a new post!  

CPhill's challenge puzzle    (12May14)

http://web2.0calc.com/questions/tricky-puzzle-problem-from-cphill-can-you-work-it-out

Collision time puzzle (12May14)

http://web2.0calc.com/questions/does-everybody-know-1-1#rr105228

Jedithious's - Water in Glasses Puzzle

http://web2.0calc.com/questions/fraction-problem

4 digit reverse number puzzled

http://web2.0calc.com/questions/math_67

Money Puzzle

You borrow $50 from your mom and $50 from your dad to buy a T-shirt.

The T-shirt costs $97 and you receive $3 change.

You give $1 to your mom, $1 to your dad and keep $1 to yourself.

Now you owe $49 to your mother $49 to your father and the $1 you kept to yourself.

$49+$49+$1 = $99.

Where did the last dollar go?

Solution:  http://web2.0calc.com/questions/math-question_54

by Rhino (12/6/14)

Another "where did the last dollar go."

3 men went to a hotel to rent a room, the cost of the room was $30. Each man paid $10 to the bellboy and proceeded to there room. After a little while the bellboy realized that there was a special on rooms that night and the price for the mens room should have been $25. On his way to the mens room to give them back $5 he was puzzled how he was going to split $5 as he had no change. He decided he would give them each $1 and keep the remaining $2 for himself. So each man originally paid $10, but after the bellboy gave each man $1 back, each man paid $9. 9 x 3 = $27 plus the $2 the bellboy put in his pocket equals $29. The original price for the room was $30. Where did the last dollar go?

Good luck with that...

http://web2.0calc.com/questions/3-men-went-to-a-hotel-to-rent-a-room-the-cost-of-the-room-was-30-each-man-paid-10-to-the-bellboy-and-proceeded-to-there-room-after-a-li

This is not really a puzzle but it is in that vein.

 Fallacious Proofs     (reinout-g)

http://web2.0calc.com/questions/begin-of-lunch-box-unwrap_2

 Puzzle time with a watery problems:    

Submitted anonymously 24/6/14

(1)  Tap A can fill up an empty tank in 3 hours.Tap B can fill up the same empty tank in 4 hours.Tap C can fill up the same empty tank in 6 hours.How many hours will it take to fill up the empty tank if all the taps are turned on at the same time?

Answers:

http://web2.0calc.com/questions/tap-a-can-fill-up-an-empty-tank-in-3-hours-tap-b-can-fill-up-the-same-empty-tank-in-4-hours-tap-c-can-fill-up-the-same-empty-tank-in-6-hours

(2)  An empty tank has a capacity of 55.2 litres.Water flows from a Tap A at 3.6 litres per mimute and 2.4 litres per minute from a Tap B.Tap A was turned on first.Tap B was turned on 2 minutes later.The taps were turned off at the same time when the tank was completely filled without overflowing.How much water flowed from Tap B?

Answers:

http://web2.0calc.com/questions/an-empty-tank-has-a-capacity-of-55-2-litres-water-flows-from-a-tap-a-at-3-6-litres-per-mimute-and-2-4-litres-per-minute-from-a-tap-b-tap-a-w

Q:  Solve for LASER+REAL=SHARE, and replace each letter to a number?

Submitted by anonymous 25/6/14

Answers: http://web2.0calc.com/questions/algebra_890

Q:  Mary is 24.  She is twice as old as Ann was when Mary was as old as Ann is now. How old is Ann?

Submitted anonymously 28/6/14

Answers:

 http://web2.0calc.com/questions/mary-is-24-years-old-she-is-twice-as-old-as-ann-when-mary-was-as-old-as-ann-is-now-how-old-is-ann

Q:  Using only 5 0's and one type of Mathematical Operator, can you get 120?

 (Well maybe 2 or 3 operators might be okay.   Submitted by  TakahiroMaeda  (1/7/14)

Answers:  

http://web2.0calc.com/questions/a-question-you-can-answer

Math activities - holiday entertainment.

NinjaDevo 5/7/14

http://www.hawebmedia.com/activites/enrichment/stumpers/index.html

Maths Fallacy - can you find it?   7/7/14

http://web2.0calc.com/questions/step-1-let-a-b

Why is 2*10 and 2*11 the same thing?

http://web2.0calc.com/questions/why-is-2-10-and-2-11-the-same-thing

NUMBER COMBINATION PUZZLES:

Is it possible to get 873 from 100 75 50 25 10 6    (Answers on this page)

http://web2.0calc.com/questions/is-it-possible-to-get-873-from-100-75-50-25-10-6

Thankyou anonymous for providing the puzzle and thanks AzizHusein for providing the clever solution. 1/8/14

Does

y Σ x X ^

mean anything to anyone?

Answer:   http://web2.0calc.com/questions/clue-for-a-riddle

Puzzles from Reinout-g     (first posted 15/5/14)
 

Puzzle time! 

http://web2.0calc.com/questions/logic-s-puzzle#rr106124

and a hint for the probability puzzle!

http://web2.0calc.com/questions/probability-puzzles#r106129

BRAIN TEASERS                      (posted by Reinout-g   15/5/2014) 

Looking for a challenge?

Have a look at one of these two! 

Scroll down to find the latest!

http://web2.0calc.com/questions/probability-puzzles

http://web2.0calc.com/questions/logic-s-puzzle

Mystery Number puzzle (8/8/14)

The mystery number has 3 digits is not divisable by 2 3 4 5 6 10

See solutions at:

http://web2.0calc.com/questions/the-mystery-number-has-3-digits-is-not-divisable-by-2-3-4-5-6-10#sthash.gTwGh0TN.dpuf

---------------------------------------------------------

DragonSlayer's riddles.  (16/8/14)

http://web2.0calc.com/questions/can-someone-help-me-out-on-this-riddle-please#r0

Thank you, Melody!

That is nice!

There is a new riddle post by DragonSlayer554.

http://web2.0calc.com/questions/funny-riddle

some are funny! Beware! You may want some more riddles!

Continuing after the War for Camelot, I continued the riddles. The following link is answering and asking riddles

http://web2.0calc.com/questions/funny-riddles-continued 

Before the War for Camelot riddles

http://web2.0calc.com/questions/funny-riddle 

1) Prison riddle from Reinout-g   (Thanks Reinout)

http://web2.0calc.com/questions/math-riddle_1

2) Car Park Puzzle from Stu   (25/9/14)

What is the missing car park number in the car lot.

16, 06, 68, 88, __ , 98   ?

http://web2.0calc.com/questions/problem-solve-this-given-to-primary-school-children-in-china#r0

The $30 hotel puzzle.    (Thanks Landry     24/9/14 )

This one has been around for ever - that is because it is so good!

I have hidden the answer so if you want the answer from a moderator you might have to beg.   LOL

http://web2.0calc.com/questions/just-a-little-riddle#rr1

New Puzzle from Radio - no answer logged yet      9/10/14         

http://web2.0calc.com/questions/random-puzzle-v2

2+2=5     Thanks  Takahiro Maeda             15/10/14

Takahiro invites you to find the fallacy

http://web2.0calc.com/questions/what-is-2-2_28

$${\sqrt{-{\mathtt{1}}}}$$   2³  Σ  Π  and it was delicious.                (17/10/14)

http://web2.0calc.com/questions/nbsp-nbsp-2-sup3-nbsp-sigma-nbsp-pi-nbsp-and-it-was-delicious

Great puzzle - Thanks flflvm97         (15/12/14)

http://web2.0calc.com/questions/flflvm-s-daily-question-day-3

Chess board number Puzzle      (26/1/15)

http://web2.0calc.com/questions/in-the-top-row-of-an-nbsp-nbsp-chessboard-tom-writes-the-values-1-2-4-8-16-32-64-128-in-the-leftmost-column-tom-writes-the-values

Coin puzzle       (31/1/15)

http://web2.0calc.com/questions/tricky-math-question

Code Puzzle   from TakahiroMaeda   (12/2/15)

http://web2.0calc.com/questions/anyone-likes-code-cracking

This number puzzle is just plain weird :)      (10/4/15)    Bertie has answered it.

http://web2.0calc.com/questions/brain-teaser_3#rr6

Carpet puzzle    (25 April 2015)

http://web2.0calc.com/questions/good-luck-with-this-one

Where did the little square go.    Great puzzle      (3/5/14)

http://web2.0calc.com/questions/where-did-a-black-square-go

A number puzzle with a difference      (9/5/15)

http://web2.0calc.com/questions/channel-21-news-public-service-announcement#rr2

A Time Puzzle.     Thanks Civonamzuk   (9/5/15)

http://web2.0calc.com/questions/how-many-times-do-the-two-hands-of-a-clock-point-in-the-same-direction-between-6-00-am-and-6-00-pm-of-a-single-day_1

Dividing land equally by shape and area Puzzle    Thanks Civonamzuk and Alan   (17/5/15)

http://web2.0calc.com/questions/a-father-wishes-to-divide-a-square-piece-of-land-among-his-five-sons-one-son-is-his-favorite-and-he-wants-to-give-him-one-quarter-of-the-l

Find the product     (30/5/15)

http://web2.0calc.com/questions/m-a-m-b-m-c-m-z

Month cipher  :)             (16/8/15)

http://web2.0calc.com/questions/talk-about-math-let-s-do-ciphers_1

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