On the game show Let's Make A Deal, Monty Hall shows you three doors. Behind one of the doors is a new car,the other two hide goats. You choose one door, perhaps #1. Now Monty shows you what's behind door #2 and it's a goat. He gives you the chance to stay with your original pick or select door #3. What do you do? Answer You should always abandon your original choice in favor of the remaining door (#3).When you make your first choice the chance of winning is 1 in 3 or 33%. When you switch doors, you turn a 2 in 3 chance of losing in the first round into a 2 in 3 chance of winning in the second round.

There were two fathers and two sons on a boat fishing. They each caught a fish, but only three fish where caught. How can this be so?
Answer There was a Grandfather, his son, and his son's son in the boat.Two fathers and two sons.

An Arab sheikh tells his two sons to race their camels to a distant city to see who will inherit his fortune. The one whose camel is slower will win. Reluctantly, the brothers started out on this unconventional "race". After wandering aimlessly for days, they came across a wise man and asked him for advice. After hearing the advice of the wise man, the brothers jump on the camels and race as fast as they can to the city. What advice did the wise man offer?
Answer He suggested they switch camels since it was obviousthey were afraid that their camel was faster than the other's.

A volcano erupts in the dark of the night. Four people, carrying only one flashlight, run for their lives. They come to a canyon. There's a footbridge that spans the canyon. The bridge can only support 2 people at a time. Since it's dark, they must use a flashlight to cross. Therefore, after 2 people cross safely, one has to go back to bring the flashlight back to the other side.

The people, suffering from different injuries, travel across the bridge at different speeds. Person #1 takes 1 minute, person #2 takes 2 minutes, person #3 takes 5 minutes, and person #4 takes 10 minutes. Two people crossing the bridge will travel at the speed of the slower person. There are only 17 minutes before the lava destroys the bridge. Find a logical solution where all four people reach the other side safely in 17 minutes or less -- but this solution cannot include having any of them go only halfway across, or go across in the dark, or throw the flashlight across, etc. AND REMEMBER: You also have to count the time it takes to go back across the bridge with the flashlight! Answer Solution 1: (1) Persons 1 and 2 cross the bridge (elapsed time 2 minutes) (2) Person 1 returns (elapsed time 3 minutes) (3) Persons 3 and 4 cross the bridge (elapsed time 13 minutes) (4) Person 2 returns (elapsed time 15 minutes) (5) Persons 1 and 2 cross the bridge (elapsed time 17 minutes). Solution 2 has Person 2 returning in (2) and Person 1 returning in (4).

In the dark! In the basement there are 3 light switches in the "off position." Each switch controls one of three light bulbs on the floor above. You may turn on any of the switches, but you may only go up stairs one time to see which light(s) were affected. How can you determine which switch controls each particular light bulb? Answer Turn any one switch to the "on" position for 5 minutes.Then turn that switch "off" and quickly turn on oneof the other two switches to the "on" position.Then run upstairs and touch the two lights that are "off."One of them will be "hot" because is was turned on for 5 minutes.Obviously the "hot" bulb is controlled by thefirst switch you turned "on." The light that is currently "on" is controlled by the switch you last turned "on." The "cold" bulb that is "off" is controlled by the only switch left. When solving problems we often need to use all our senses.

There are eight pills. They are all the same size and color. One pill weighs slightly more than the others and it is poisonous. You have a balanced scale and can only use it twice. How can you find the poisoned pill? Answer Take any six pills and divide them into two groups of three each; if the two groups weigh out evenly, weigh the remaining two pills to find the poisoned one. If the two groups of three do not weigh out evenly, simply take two out of the three pills from the heavier scale and weigh them (using the scale a second time). The two pills will either weigh the same, in which case the remaining pill is the poisoned one -- or one of the two pills on the scale will weigh more -- Voila!