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Math and logic riddle thread
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doodlesmom




 
 
    
 

Post Thu, Oct 22 2020, 6:39 pm
ChanieMommy wrote:
Hidden: 

802?


Yes my dear!
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tothepoint




 
 
    
 

Post Thu, Oct 22 2020, 7:13 pm
doodlesmom wrote:
Hint please


Start with an equilateral triangle with one tree on each corner
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tothepoint




 
 
    
 

Post Thu, Oct 22 2020, 7:14 pm
You’ve got an 8×8 checkerboard and a bunch of dominoes that each fit nicely on two squares of the checkboard. You can easily tile the entire checkerboard with these dominoes.

Now say that you remove two squares, one at one corner and the other at the opposite corner. You’re left with 62 squares. Can you tile this with the dominoes? If so, show how. If not, prove why not.
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ExtraCredit




 
 
    
 

Post Thu, Oct 22 2020, 7:16 pm
doodlesmom wrote:
A 10-volume encyclopedia ,labeled A thru J, sits on a bookshelf in an orderly fashion. Each volume contains 100 pages. A book worm starts at the first page of the first volume and worms it's way thru til the last page of the last volume. How many pages did the worm tunnel thru?

Hidden: 

802, but I’ve done this riddle before so wasn’t a challenge
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ExtraCredit




 
 
    
 

Post Thu, Oct 22 2020, 7:17 pm
tothepoint wrote:
Start with an equilateral triangle with one tree on each corner

Can’t get more than 5 rows. Ready for the answer.
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ExtraCredit




 
 
    
 

Post Thu, Oct 22 2020, 7:18 pm
tothepoint wrote:
You’ve got an 8×8 checkerboard and a bunch of dominoes that each fit nicely on two squares of the checkboard. You can easily tile the entire checkerboard with these dominoes.

Now say that you remove two squares, one at one corner and the other at the opposite corner. You’re left with 62 squares. Can you tile this with the dominoes? If so, show how. If not, prove why not.

Let me get a pen Laugh
Hidden: 

If the empty squares are diagonally across it won’t work. I dunno why but I tried with a pen. Final answer.
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tothepoint




 
 
    
 

Post Thu, Oct 22 2020, 7:27 pm
ExtraCredit wrote:
Let me get a pen Laugh
Hidden: 

If the empty squares are diagonally across it won’t work. I dunno why but I tried with a pen. Final answer.


Ok, on the right track. There’s a very logical reason to prove why it will/won’t work.
Hint:
Hidden: 

think abt the colors of the squares


Last edited by tothepoint on Thu, Oct 22 2020, 7:29 pm; edited 1 time in total
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tothepoint




 
 
    
 

Post Thu, Oct 22 2020, 7:29 pm
ExtraCredit wrote:
Can’t get more than 5 rows. Ready for the answer.


I’ll add another hint.
Hidden: 

Draw a tree in the center of the triangle.
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realsilver




 
 
    
 

Post Thu, Oct 22 2020, 7:39 pm
I got the answer but I don’t know how to post a hidden reply!
Anyone?
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tothepoint




 
 
    
 

Post Thu, Oct 22 2020, 7:56 pm
realsilver wrote:
Hidden: 

testing


Yay! My answer:
Hidden: 



@
@ @
@
@ @ @
Obviously can’t be perfect on a screen
[align=center]


👍. Couldn’t see format at first, only when I hit reply the correct format appeared. Great job!
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realsilver




 
 
    
 

Post Thu, Oct 22 2020, 7:57 pm
tothepoint wrote:
👍. Couldn’t see format at first, only when I hit reply the correct format appeared. Great job!


Lol if you notice I deleted my post because it came out strange...
glad you saw it first;)
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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 10:00 am
Can someone post the answer without hiding the content? Hiding it changes the shape. I’d love to see the answer by now.
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ChanieMommy




 
 
    
 

Post Sun, Oct 25 2020, 11:46 am
Hidden: 


.......o
....o.o.o
..o...o...o

It's a bit hard to reproduce here... it has to be an equilateral triange... with a tree at every summit, at the center, and in the middle of each side...

You can go from every summit through the center to the middle of the opposite side... that's three, plus the three sides is six...
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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 12:20 pm
ChanieMommy wrote:
Hidden: 


.......o
....o.o.o
..o...o...o

It's a bit hard to reproduce here... it has to be an equilateral triange... with a tree at every summit, at the center, and in the middle of each side...

You can go from every summit through the center to the middle of the opposite side... that's three, plus the three sides is six...

What do you know I typed this a few minutes after the riddle was posted last week, then deleted because decided it’s only 5. I’m having a hard time finding the sixth here.
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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 12:22 pm
Hidden: 

You get 3 starting with the top tree.
Then I see 2 horizontal lines on row #2 & #3. That’s 5. Where’s the 6th?
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ChanieMommy




 
 
    
 

Post Sun, Oct 25 2020, 12:54 pm
ExtraCredit wrote:
Hidden: 

You get 3 starting with the top tree.
Then I see 2 horizontal lines on row #2 & #3. That’s 5. Where’s the 6th?


Hidden: 

You have to plant your trees on ABCDEF and O

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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 1:12 pm
ChanieMommy wrote:
Hidden: 

You have to plant your trees on ABCDEF and O


Hidden: 

Oh I didn’t put the O in the right place. Brilliant! Thanks for the graphics!
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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 3:57 pm
Need something new here. Need to get my mind off the loss of my pot...
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tothepoint




 
 
    
 

Post Sun, Oct 25 2020, 5:58 pm
A man conducting a survey visits the home of a woman. He knocks on the door and sees a woman with her three children. He asks for the ages of her children. She tells him, “The product of their ages is 72. And the sum of their ages is the number on the door.” So the man goes outside and checks the number of the door. He comes back and says, “I need more information.” She replies: “The oldest one likes strawberries.” Immediately, the man figures out their ages. What are their ages?
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ExtraCredit




 
 
    
 

Post Sun, Oct 25 2020, 5:58 pm
tothepoint wrote:
A man conducting a survey visits the home of a woman. He knocks on the door and sees a woman with her three children. He asks for the ages of her children. She tells him, “The product of their ages is 72. And the sum of their ages is the number on the door.” So the man goes outside and checks the number of the door. He comes back and says, “I need more information.” She replies: “The oldest one likes strawberries.” Immediately, the man figures out their ages. What are their ages?

Thank youuuuu. Now let me read...
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