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| Acmlm's Board - I2 Archive - Brain Teasers - Interesting calculation |
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Mr. F-Zero Paratroopa Level: 20  Posts: 46/158 EXP: 40634 For next: 1805 Since: 09-09-04 From: London Since last post: 176 days Last activity: 52 days |
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| This part isnt the brainteaser, but a fun part of it. Think of a number between 1 and 10. Double it and add 5. Multiply the result by 50, then add 1754. If you havent had your birthday this year, add one. Now subtract the four-digit year you were born. If you've done it all correctly, you should have a 3-digit number; the first digit was your original number, and the other two are your age. Now this is the calculation: what is the formula to get this right for almost any case, and why? And in which cases will it not be correct? |
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Smallhacker Green Birdo SMW Hacking Moderator Level: 68  Posts: 742/2273 EXP: 2647223 For next: 81577 Since: 03-15-04 From: Söderhamn, Sweden Since last post: 10 hours Last activity: 9 hours |
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| X 2X + 5 100X + 250 100X + 2004 100X + 16 That's too simple... By the way... In 2005, you have to add 1755 instead of 1754. (edited by Smallhacker on 10-25-04 03:35 PM) (edited by Smallhacker on 10-25-04 04:50 PM) |
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Teundusia Lantern Ghost Level: 41 Posts: 77/760 EXP: 449109 For next: 31036 Since: 07-31-04 Since last post: 15 hours Last activity: 14 hours |
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| That was amazing... my math teacher has just played that trick on us! Heres another one (I hope you dont mind me posting it here) 1) Think of any number (this means ANY number. Me and my mate checked about 700 different numbers including negatives, decimals, whole numbers, the lot... they all worked!) 2) Add 7 3) Double the answer 4) Minus 4 5) Half the answer 6) Take away the number you started with The answer is always 5! Here are some examples::: Start number= 3 3+7=10 10x2=20 20-4=16 16/2=8 8-3=5! Start number= -6 (-6)+7=1 1x2=2 2-4=-2 (-2)/2=-1 (-1)+(-6)=(-1)+6=5! Start number= 2.294 2.294+7=9.294 9.294x2=18.588 18.588-4=14.588 14.588/2=7.294 7.294-2.294=5! See? It always works!!! |
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Smallhacker Green Birdo SMW Hacking Moderator Level: 68 Posts: 743/2273 EXP: 2647223 For next: 81577 Since: 03-15-04 From: Söderhamn, Sweden Since last post: 10 hours Last activity: 9 hours |
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| 1) Think of any number (this means ANY number. Me and my mate checked about 700 different numbers including negatives, decimals, whole numbers, the lot... they all worked!) 2) Add 7 3) Double the answer 4) Minus 4 5) Half the answer 6) Take away the number you started with X X+7 2X+14 2X+10 X+5 5 Not very complicated either. |
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Reshaper256 Bee Level: 19  Posts: 62/143 EXP: 34776 For next: 1001 Since: 09-14-04 From: United States Since last post: 5 days Last activity: 9 hours |
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| edit: Dang it Smallhacker, I spent too much time making this darn gif and you beat me to answering! Well, I'll post it anyway, since I took the time to make it and everything... Let x = any number  As you can see, the reason you always get 5 is because you always subtract the number you started with at the end.  (edited by Reshaper256 on 10-25-04 05:07 PM) (edited by Reshaper256 on 04-03-05 05:56 PM) (edited by Reshaper256 on 04-13-05 05:57 AM) |
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Heian-794 Red Super Koopa Level: 44 Posts: 511/896 EXP: 611014 For next: 271 Since: 06-01-04 From: Kyoto, Japan Since last post: 21 days Last activity: 10 days |
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| Reshaper, how the heck did you make a transparent GIF? That's as good a brain teaser as anything else in these threads! | |||
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Smallhacker Green Birdo SMW Hacking Moderator Level: 68 Posts: 768/2273 EXP: 2647223 For next: 81577 Since: 03-15-04 From: Söderhamn, Sweden Since last post: 10 hours Last activity: 9 hours |
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| May drawing programs can do that. (Older versions of Paint could as well, but not the newer ones for some reason...) | |||
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Reshaper256 Bee Level: 19 Posts: 71/143 EXP: 34776 For next: 1001 Since: 09-14-04 From: United States Since last post: 5 days Last activity: 9 hours |
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Smallhacker, I feel like I'm following you around or something -- I've posted after you the last three times I think. It's not on purpose, I promise.  Originally posted by Heian-794Actually I just googled transparent gif and found http://www.gifworks.com/. It's a webpage that'll fix your gifs anyway you want. I wish I had a program on my own computer that would do it though, that would be less of a hassle.  (edited by Reshaper256 on 10-27-04 09:07 PM) |
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