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what's next???

Forums: Riddles
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fave17
 
Reply Wed 30 Apr, 2003 09:38 pm
9,18,36,63,??



43,45,65,97,??
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Type: Discussion • Score: 1 • Views: 3,358 • Replies: 20
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bobsmyth
 
  1  
Reply Wed 30 Apr, 2003 11:21 pm
what's next???
108


??
0 Replies
 
fave17
 
  1  
Reply Fri 2 May, 2003 07:55 pm
thanks! but how did you get 108?
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bobsmyth
 
  1  
Reply Sat 3 May, 2003 04:38 am
what's next???
Each of the numbers when added together total nine (9, 8+1 etc.). The next number after 18 should have been 27 but was skipped to 36. Then the next number two possibilities were skipped. So I skipped three to get 108.
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mac11
 
  1  
Reply Mon 5 May, 2003 12:29 pm
Deleted due to stupidity of poster! Rolling Eyes
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bobsmyth
 
  1  
Reply Mon 5 May, 2003 01:59 pm
what's next???
The sequence is 2, 22, 32 which further compounds it. Threw me for a loop too.
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mac11
 
  1  
Reply Mon 5 May, 2003 02:08 pm
How is the sequence 2, 22, 32, bob? I don't understand that...
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bobsmyth
 
  1  
Reply Mon 5 May, 2003 02:30 pm
what's next???
sequence: 43, 45, 65, 97, ??

43+2=45, 45+20=65, 65+32=97
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mac11
 
  1  
Reply Mon 5 May, 2003 02:32 pm
Whoops, yes I see now...thinking...
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LibertyD
 
  1  
Reply Mon 5 May, 2003 04:17 pm
I'll give it a shot:

81 and 135
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mac11
 
  1  
Reply Mon 5 May, 2003 08:24 pm
Hi LibertyD (and welcome!) Can you tell us why? Because I don't see it yet... Very Happy
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LibertyD
 
  1  
Reply Mon 5 May, 2003 09:57 pm
Hi Macsm11 (and thanks for the welcome!)

In the first group, it looks like the sequence is reversed, so I reversed 18 to get 81.

In the second group, the differences between the numbers were 2, 20, and 32. I took the differences between those three numbers, which are 18 and 12 and figured that the next appropriate number would be 6. Adding 6 to 32 and then 38 to 97 is how I got 135. I hope I'm not way off base, but it made sense to me! Very Happy

43 45 65 97 135
2 20 32 38
18 12 6
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bobsmyth
 
  1  
Reply Mon 5 May, 2003 10:26 pm
what's next???
Looks good to me, LibertyD. Well done and let me add my welcome. Good to have you here. You saved our bacon.
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LibertyD
 
  1  
Reply Mon 5 May, 2003 11:52 pm
Hi BobSmyth...thanks!
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mac11
 
  1  
Reply Tue 6 May, 2003 06:56 am
Whew! Good job, Liberty!
0 Replies
 
Lunitic
 
  1  
Reply Wed 18 Jun, 2003 05:43 pm
Since it has been two months i asume that you have found the answer to the whole riddle. What is it?
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willzwhale
 
  1  
Reply Mon 30 Jun, 2003 04:47 am
how about 3,4,6,8 ?
0 Replies
 
waterbottle
 
  1  
Reply Wed 2 Jul, 2003 01:59 pm
i'm thinking 12.

prime numbers +1?
0 Replies
 
LandWalker
 
  1  
Reply Thu 3 Jul, 2003 11:17 am
Actually, the next number in the sequence of 9, 18, 36, 63, ?? is 99.

9 = (9 x 1)
18 = (9 x 2)
36 = (9 x 4)
63 = (9 x 7)

You increase the other factor by 1, 2, 3. So logically, the next factor is 11: 9 x 11 = 99.

By the way, 9 isn't a prime number, nor is 4.
0 Replies
 
renew
 
  1  
Reply Sun 17 Aug, 2003 09:32 am
the formula should like the following:

9
18 ( 9 + 9x1)
36 (18 + 9x2)
63 (36 + 9x3)
99 (63 + 9x4)
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