[*Talok]

T_aus., on 11 November 2009 - 04:54 PM, said:

Some people like to look formal and be comfortable also...good for indoors Thailand.

Its all nice to look at painted feet at this late hour, although i prefer the unpainted stuff later on this week.

Try to solve this mathematical illusion that was proposed by my calculus teach ages ago (so i dont remember the solution, sorry)

• 3 guys go out to lunch.
  
• They carry 100 Baht each.
  
• They eat & drink.
  
• The bill to the waiter is (check-bin) = 300 Baht.
  
• They say "okay so we lay down 100 each". Jolly good. Waiter happy. (3 x 100 = 300, all well)
  
• The waiter says: "solly, I make a mistake, you pay only 250 Baht" (yes, these honest-mistakes-following-exclamations actually happen)
  
• Waiter puts back 50 Baht (300 - 50 = 250, all well) - five 10-Baht coins.
  
• The 3 guys decide to take back 30 Baht - each guy gets a 10-Baht coin back. Easy devide.
  
• 20 Baht remains as 'tip' for the waiter (and his honesty) - two 10-Baht coins. No sweat.

So... each guy got 10 Baht back from 100 Baht they gave in the first place. So they really spent 90 Baht.

3 guys spent 90 Baht... so then... 3 x 90 = 270.......... BUT they left 20 Baht as 'tip'

270 (spent) + 20 (tip) = 290 (!!!!!!!!!!) ... not '300' - as they actually payed in the beginning of this story...


Where the hell did that 10 Baht go????

This post has been edited by Tokla: 17 November 2009 - 03:14 AM

[T_aus.]

F = 300
a = 100
c = F/3
d = tip

[F(d) + c] - [F(a) + c] = F(d) + c - F(a) - c = F(d) - F(a)= 10 baht!!

This post has been edited by T_aus.: 17 November 2009 - 07:03 AM