Brain Teasers and Puzzles 

There are three houses, and three utilities: water, gas, and electricity.

Your task is to connect each house to all three utilities.

Therefore, each house will have three lines, and each utility will also have three lines.

However, you cannot cross lines! You cannot pass lines through houses or utilities. You cannot share lines.

Can you draw the 9 lines required?

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You can imagine an arrow in flight, toward a target. For the arrow to reach the target, the arrow must first travel half of the overall distance from the starting point to the target. Next, the arrow must travel half of the remaining distance.

For example, if the starting distance was 10m, the arrow first travels 5m, then 2.5m.

If you extend this concept further, you can imagine the resulting distances getting smaller and smaller. Will the arrow ever reach the target?

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Three people check into a hotel.

They pay £30 to the manager and go to their room.

The manager suddenly remembers that the room rate is £25 and gives £5 to the porter to return to the people.

On the way to the room the porter reasons that £5 would be difficult to share among three people so they keep £2 and give £1 to each person.

Now each person paid £10 and got back £1.

So they paid £9 each, totalling £27. The porter has £2, totalling £29.

Where is the missing £1?

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