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puzzle for a sat evening

 
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Author puzzle for a sat evening
rainbow
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Joined: 25 Feb 2010
Posts: 202

Post: #1   PostPosted: Fri Jul 15, 2011 9:57 pm    Post subject: puzzle for a sat evening Reply with quote

How long would you take to solve this?


|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | ? | 56 |
|---+----+----+------+------|


Cheers
Rainbow
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Dabangg
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Joined: 15 Sep 2010
Posts: 11

Post: #2   PostPosted: Fri Jul 15, 2011 10:21 pm    Post subject: Reply with quote

|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | 91 | 56 |
|---+----+----+------+------|

AEOM
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aromal
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Joined: 22 Mar 2010
Posts: 302

Post: #3   PostPosted: Sat Jul 16, 2011 8:06 am    Post subject: Re: puzzle for a sat evening Reply with quote

rainbow wrote:
How long would you take to solve this?


|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | ? | 56 |
|---+----+----+------+------|


Cheers
Rainbow
artist wat is it...... give simple one
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amolmails
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Joined: 29 Apr 2008
Posts: 45

Post: #4   PostPosted: Sat Jul 16, 2011 8:21 am    Post subject: Answers Reply with quote

took 40 sec 91 Laughing
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Shahii
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Joined: 15 Apr 2011
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Post: #5   PostPosted: Sat Jul 16, 2011 1:48 pm    Post subject: Re: puzzle for a sat evening Reply with quote

Easy one... Smile

|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | ? | 56 |
|---+----+----+------+------|

1st row 12 + 3*1 = 15
2nd row 20 + 4*2 = 28
3rd row 30 + 5*3 = 45
4th row 42 + 6*4 = 66
5th row 56 + 7*5 = 91 Ans...
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vinay28
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Joined: 24 Dec 2010
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Post: #6   PostPosted: Sat Jul 16, 2011 8:33 pm    Post subject: Reply with quote

Shaii, one doesn't need the number in the last column (i.e. the last number in each row) to solve it.

1+2*(3+4)
1+3*(4+5)
1+4*(5+6)
1+5*(6+7)
1+6*(7+Cool=91
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hemzbond
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Joined: 21 Jul 2009
Posts: 30

Post: #7   PostPosted: Sun Jul 17, 2011 2:51 am    Post subject: Re: puzzle for a sat evening Reply with quote

rainbow wrote:
How long would you take to solve this?


|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | ? | 56 |
|---+----+----+------+------|


Cheers
Rainbow


i have used the second and the third columns to get to fourth
2nd column * ( 3rd column +1,2... )= 4th column

3*(4+1)=15
4*(5+2)=28
5*(6+3)=45
6*(7+4)=66
7*(8+5)=91
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rainbow
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Joined: 25 Feb 2010
Posts: 202

Post: #8   PostPosted: Sun Jul 17, 2011 11:14 am    Post subject: Re: puzzle for a sat evening Reply with quote

Yes, 91 is correct. and Shahii and Vinay have even provided the logic (via different routes) to arrive at it. nice fun!

btw, here is the spreadsheet that was password protected, with the answer from this puzzle as the key


and for some time now, owing to other commitments, this might be the last week on icharts for me. but then its a small world and the Internet makes it even smaller Very Happy

Enjoy the weekend, have fun, and take care all!

Cheers
DJ



rainbow wrote:
How long would you take to solve this?


|---+----+----+------+------|
| 2 | 3 | 4 | 15 | 12 |
|---+----+----+------+------|
| 3 | 4 | 5 | 28 | 20 |
|---+----+----+------+------|
| 4 | 5 | 6 | 45 | 30 |
|---+----+----+------+------|
| 5 | 6 | 7 | 66 | 42 |
|---+----+----+------+------|
| 6 | 7 | 8 | ? | 56 |
|---+----+----+------+------|


Cheers
Rainbow



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