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# This'll get you thinking...

Former Member
Posts: 1,876,323

**The Mix Honorary Guru**
in General Chat

Some of you may have already heard of this little math's trick.

Three guy's booked a hotel room for the night which cost's £30, so they each give £10 which equals £30.

Then, the hotel worker realises that the room actually costs £25, so he walked into their room with £5 and didn't know how to split it so he gave them £1 each, and kept the remaining £2. So this mean's that each guy paid £9.

3 x £9 = £27, plus the £2 that the hotel guy has equals £29. Where did £1 go.......................

Three guy's booked a hotel room for the night which cost's £30, so they each give £10 which equals £30.

Then, the hotel worker realises that the room actually costs £25, so he walked into their room with £5 and didn't know how to split it so he gave them £1 each, and kept the remaining £2. So this mean's that each guy paid £9.

3 x £9 = £27, plus the £2 that the hotel guy has equals £29. Where did £1 go.......................

0

## Comments

The Mix Honorary GuruThe Mix Honorary GuruProblem comes when there are actually six numbers between 25 and 30:

25, 26, 27, 28, 29, 30

so adding 5 to this, ie, the fifth along that line leaves you with 29, not 30.

By taking off five, it break the equation somehow and the final result isn't actually related to the question, so you get a discrepancy.

This problem is actually based of a real life event that happened a while ago and brought a serious lawsuit against the Holiday Inn

The Mix Honorary GuruYou don't add the two pounds, you take it away. So 25 is with the owner, three with the people and two in the pocket, so that's 30.

The Mix Honorary GuruThe Mix Honorary GuruThe Mix Honorary Guruaaargh I saw that the other day and spent ages trying to work it out, then when I clicked for the answer it said I had to pay to join the site :impissed:

The Mix Honorary GuruIf you look closely (the squares really help here), the gradient of the hypotenuse (yay - I get to use big words ) of the first triangle is different to that of the second. They don't match up, but look as though they should.

Since they don't match up, when you re-arrange the triangles and the polygons, you get a small gap of 1 square at the bottom

:cool:

The Mix Honorary GuruTry this one for size .......

"U2" has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge.

You must help them across to the other side. It is night.

There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight

with them. The flashlight must be walked back and forth, it cannot be thrown, etc. Each band member walks at a different speed.

A pair must walk together at the rate of the slower man's pace:

Bono:- 1 minute to cross

Edge:- 2 minutes to cross

Adam:- 5 minutes to cross

Larry:-10 minutes to cross

For example: if Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then

returns with the flashlight, a total of 20 minutes have passed and you have failed the mission.

Notes: There is no trick behind this. It is the simple movement of resources in the appropriate order. There are two known answers to this

problem. This is based on a question Microsoft gives to all prospective employees.

Note: Microsoft expects you to answer this question in under 5 minutes!

Don't take it too hard if you don't figure this out...

The Mix Honorary Guruthen bono comes back so another minute

then larry and and adam go across 10 mins

then edge goes back 2 mins

then edge and bono go across another 2 minutes.

17 minutes total