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Brain Teasers

You have just moved into a mansion with a cellar in the basement. on the main floor, next to the stair case are 3 switches that control the bulbs in different parts of the house.
You would like to know which one turns on the lights in the cellar. how can you find out which light switch is wired to the cellar by making a single trip to the cellar? you are alone in the house, the wiring is hidden behind the wall and the rooms controlled by the three switches are not visible from where you are standing.

A: First turn on 2 switches after 5 minutes turn off one of the switches that you turned on then go to the basement if the light isn't turned on then touch it if it's hot then you'll know which switch controls it.
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What is the largest possible number you can write using only 2 numbers?

A: 99, this is 9x9x9x9x9x9x9x9x9 or 387,420,489
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Mom, Dad, and 2 kids have come to a river, and they find a boat. It is small and can only carry one adult or 2 kids at a time. Both kids are good rowers, but how can the whole family reach the other side of the river?

A: The kids row across. One comes back. An adult goes over, and the kid comes back. Both kids row across again, and one comes back. The other adult rows across and the kid comes back. Both kids row across again.
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You are given 5 bags. There are 10 beads in each of the bags. In four of the bags, the beads each weigh 10 grams. In the remaining bag, each bead weighs only 9 grams. All the bags and beads look identical. You must find out which bag has the lighter beads. The problem is that all the bags look identical and all the beads look identical. You can use a scale, but it has to be a single-tray scale, not a two-tray balance scale. Also, you may use the scale only once. How can you find out which bag has the lighter beads?

A: Label the bags from 1 to 5. Take 1 bead out of Bag 1, and label it 1. Take 2 beads out of Bag 2, and label them both with a 2. Take 3 beads out of Bag 3, and label each with a 3. Continue this pattern with Bags 4 and 5. Put these 15 beads on the tray of the scale.

If all 15 weighed 10 grams, the scale would register 150 grams. But since one or more of the beads weighs only 9 grams, the scale will register less than 150. Subtract the number on the scale from 150. Your answer will tell you the number of the bag with the lighter beads. (If the scale registers 148, it’s bag #2. If the scale registers 145, it’s bag #5.)
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As I was going to St Ives,
I met a man with seven wives,
Each wife had seven sacks;
Each sack had seven cats;
Each cat had seven kittens.
Kits, cats, sacks, and wives,
How many were going to St Ives?

A: 1 (me only) we don't know where the others are going!
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A rope-ladder is hanging over the side of a ship. The ladder is 12 feet long, and the rungs are one foot apart. The lowest rung is resting on the top of the ocean. The tide rises at the rate of four inches per hour. How long will it take before the first four rungs of the ladder are under water?

A: Forever, the boat rises with the tide.
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What is the maximum number of times a normal sheet of (news)paper can be folded in half by hand?

A: 7 or 8 max (the world record is 12)
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I am lighter than a feather, but big as a building. 100 tracktors can't pull me off the ground. What am I?

A: The building's shadow.
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What is greater than god, more evil than the devil, the poor have it, the rich need it, and if you eat it you will eventually die?

A: Nothing
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What can you give away yet still keep?

A: A cold
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A 1 liter of water is needed, you have an empty 3 liter and 5 liter bottles, how to measure out 1 liter?

A: Fill the 3L. and empty it in the 5L, fill the 3L again and from it add to the 5L till it completely fills, there will remain 1L in the 3L.
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White and balck marbles to save you from death penalty, best solution to get at least 50% to live
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In British Columbia you cannot take a picture of a man with a wooden leg. Why not?

A: Because You need a camera to take a picture, not a wooden leg
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You with a wolf, a chicken and corn need to pass the other side of a river with a boat that can carry only 2 things at a time.

A: take the chicken, comeback and take the wolf, leave the wolf and return the chicken, leave the chicken and take the corn and leave it with the wolf, and last take the chicken.
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How many squares?

A: 40
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