## Welcome to BrainDen.com - Brain Teasers Forum

 Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account. As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends. Of course, you can also enjoy our collection of amazing optical illusions and cool math games. If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top. If you have a website, we would appreciate a little link to BrainDen. Thanks and enjoy the Den :-)
Guest Message by DevFuse

# No. 10

6 replies to this topic

### #1 rookie1ja

rookie1ja

Senior Member

• 1344 posts
• Gender:Male
• Location:Slovakia

Posted 31 March 2007 - 05:27 PM

No. 10 - Back to the Cryptograms and Algebra Puzzles
Replace the same characters by the same numerals so that the mathematical operations are correct.
(AA)B = ABBA

This old topic is locked since solution is already provided in the Spoiler below.
Pls visit New Puzzles section to see always fresh brain teasers.

Spoiler for Solution

• 0

Optical Illusions
Support BrainDen

"To start: Press any key... Where's the 'any' key?" - Homer Simpson

### #2 JASON4P8C10

JASON4P8C10

Newbie

• Members
• 7 posts

Posted 08 September 2007 - 06:00 AM

(AA)(multiplied by itself B times) = ABBA

A=2 B=1
2x2 to the 1st = 2x1x1x2=4
AxA to the B = AxBxBxA

A=2 B=2
2x2 to the 2nd =2x2x2x2=16
AxA to the B = AxBxBxA

THANK YOU THANK YOU
I ACCEPT DONATION
• 0

### #3 mjoeck

mjoeck

Newbie

• Members
• 1 posts

Posted 09 September 2007 - 12:59 AM

The ABBA doesn't imply multiplication as variables next to each other usually do. In these types of problems, each letter is assumed to be in position as if base ten numbers had been transposed with different letters of the alphabet. For example: 16 could be represented by AB, FD, UR, LH, etc. but not by AA. The puzzle is asking you which 2-digit multiple of 11, when raised to a single digit power, yields a 4-digit answer whose first and last digits are the same as those in the multiple of 11 and whose middle two digits are the power it was raised to. For example, raising 11 (represented by "AA") to the 2nd power (represented by "B") would give 121 (or "ABA"). We need a four digit answer though, so we need to either choose a higher multiple of 11, a higher power, or both. Happy solving!
• 0

### #4 guderman

guderman

Newbie

• Members
• 3 posts

Posted 26 September 2007 - 08:41 PM

this one is too easy...

11^3 = 11 * 11 * 11 = 11 * 121 = 1331
• 0

### #5 BoilingOil

BoilingOil

Junior Member

• Members
• 71 posts

Posted 26 September 2007 - 10:54 PM

this one is too easy...

11^3 = 11 * 11 * 11 = 11 * 121 = 1331

And then you beat me to it a second time! I'm impressed
• 0

### #6 LordHawke

LordHawke

Newbie

• Members
• 2 posts

Posted 30 January 2009 - 09:31 PM

I thought the same thing, and that is true, as long as ABBA=A*B*B*A. Then I realized ABBA is a 4-digit number w/ with the 2nd and 3rd being the same and the 1st and 4th being the same.

(AA)(multiplied by itself B times) = ABBA

A=2 B=1
2x2 to the 1st = 2x1x1x2=4
AxA to the B = AxBxBxA

A=2 B=2
2x2 to the 2nd =2x2x2x2=16
AxA to the B = AxBxBxA

THANK YOU THANK YOU
I ACCEPT DONATION

• 0

### #7 James T

James T

Junior Member

• Members
• 64 posts

Posted 09 April 2009 - 01:08 AM

No. 10 - Back to the Cryptograms and Algebra Puzzles
Replace the same characters by the same numerals so that the mathematical operations are correct.
(AA)B = ABBA

Spoiler for different interpretation

Edited by James T, 09 April 2009 - 01:08 AM.

• 0

#### 0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users