View Full Version : Maths question (is impossible)
LittleGrizzly
10-05-2004, 04:35
3 guys go into a shop to buy a TV, its 30 pound so they each pay 10 pound. As they're walking away the shop owner runs after them and told them they paid too much, the TV is only worth 25 pounds. They said for running up he can have 2 pounds and they had a pound each.
they each paid 9 pound for the TV (3x9 = 27)
they gave the shop owner 2 pound
that makes 29 pound. Where did the extra pound dissappear ?
Sasaki Kojiro
10-05-2004, 05:24
They gave him 30 pounds. He runs after them with 5 pounds in his hand, leaving 25 behind. He gives them each one pound, and takes 2 back with him. Now each of the three men has one pound, making 3 pounds total outside the store. he takes back 2 pounds and puts it in with the 25 to make 27 pounds. 27 + 3 = 30 ~:)
LittleGrizzly
10-05-2004, 05:32
yes it works out when you do it that way i did that myself
but they paid 9 pound each and gave him 2 pound how does the pound dissappear when you look at it that way ?
LittleGrizzly
10-05-2004, 08:08
but they paid 10 pounds and recieved a pound back each making thier total contribution 27 pounds
TonkaToys
10-05-2004, 08:46
but they paid 10 pounds and recieved a pound back each making thier total contribution 27 pounds
Why don't we do an experiment... you send me 30 pounds in 3 batches of 10 pound coins. I'll send you back 1 pound from each batch... perhaps we can figure it out that way.
I'm willing to keep trying until we figure it out!
LittleGrizzly
10-05-2004, 08:59
Why don't we do an experiment... you send me 30 pounds in 3 batches of 10 pound coins. I'll send you back 1 pound from each batch... perhaps we can figure it out that way.
I'm willing to keep trying until we figure it out!
lol
Mouzafphaerre
10-05-2004, 09:49
-
LOL! Good one there!
_
Papewaio
10-05-2004, 10:04
Start from the top.
3 guys, 10 pounds each. 30 pounds.
Shopkeeper makes a mistake, the total is 25 pounds.
Mates decide that it is a decent thing and give the shopkeeper and extra two pounds. Total for the TV is now 27 pounds.
Each of the mates pockets a pound each. For a total of 3 pounds change.
The confusion is that the Cost of the TV is 27 pounds and the guys have 3 pounds change to add to that total (not the amount the shopkeeper pockets for honesty).
i could never get this
30($ paid)-3($ back, $1 each) = 27
27-2(tip) = 25
30($ paid) -5 = 25 (real price)
25=25
how is this confusing?
LittleGrizzly
10-05-2004, 10:30
look i realise it works one way but the point is it does not work the other
they each paid 9 pound each, 3 of them making 27 pound with a 2 pound tip for the honest shop keeper that makes 29 pounds. how does the pound dissappear ?
look i realise it works one way but the point is it does not work the other
they each paid 9 pound each, 3 of them making 27 pound with a 2 pound tip for the honest shop keeper that makes 29 pounds. how does the pound dissappear ?
i don't get it. they each paid 9. that's 27
25 for the TV and 2 for the tip. why are you adding the 2 to 27?
LittleGrizzly
10-05-2004, 10:52
why are you adding the 2 to 27?
the paid 9 pound each (the 27) the shop keepers tip (2) so im adding the 2 to 27 to get the total amount they paid
English assassin
10-05-2004, 10:55
look i realise it works one way but the point is it does not work the other
they each paid 9 pound each, 3 of them making 27 pound with a 2 pound tip for the honest shop keeper that makes 29 pounds. how does the pound disappear ?
Because you double count the two pounds that way. A pound has to be in the till for the TV, in the mens pockets as change, or in the shopkeepers pocket as a tip, right?
When you say they paid £27, that is £25 in the till plus £2 in the shopkeepers pocket. You can't then go on to say that £27 plus the £2 pound tip makes £29, because you've counted the same tip money twice. (and the change not at all)
Papewaio
10-05-2004, 10:59
The two dollars is added to the 25... you are double counting the tip ($2) and not counting the amount the guys get back at any point ($3).
You are essentially doing this:
a) (Cost of TV) + Tip + Tip
instead of
b) (cost of TV) + Tip + Change.
Cost of TV = $25
Tip = $2
Change = $3
So Cost of TV + Tip = $27 (9 dollars each) leaving one pound to each in change (Change = $3).
LittleGrizzly
10-05-2004, 11:05
ahh, thanks this will annoy my friend (always good)
Papewaio
10-05-2004, 11:08
Glad to help annoy someone else... particularly if your friend is English... ~:cheers:
LittleGrizzly
10-05-2004, 11:13
no much worse.... welsh (though being english im biased)
according to him (though he is a compulsive lair) no-ones ever managed to answer this so congratulations on being smarter than everyone who's seen it
A.Saturnus
10-05-2004, 21:45
I can assure you, a lot of people have answered it.
Start with three guys with ten each = 30
minus 25 for the TV (30-25=5)
minus two for the shopkeep (30-25-2=3)
and each guy has one at the end (1+1+1=30-25-2=3)
. . . accounting for all of the money
NOT Start with three guys with ten each = 30
They pay 30, but get five back (30-25=5)
then they give the shopkeep two and split the remaining three so that they have 27 and shopkeep has 2 (=29 not 30)
The deal starts with 30 and at the end the guys each have one (=3) and the shopkeep has 27 (25 for the TV and 2 for the tip)
:bow:
ichi
Edit: Jeeze, in the time since I loaded this thread, it's been answered several times. Move along, nothing to see here.
vBulletin® v3.7.1, Copyright ©2000-2025, Jelsoft Enterprises Ltd.