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12 Logic Puzzles That Will Prepare You For Real Life

You may not be able to figure them out so quickly, but they might save the day if you do!

Posted on August 16, 2013, at 5:07 p.m. ET

  1. 3 girls, but only 2 condoms

    Willywutang would like to have safe sex with three women, any of whom may be carrying an STD. Given two condoms, how can he do so, while ensuring that no STD is passed from one woman (or possibly himself) to another (or to himself)? (This may not be recommended by health professionals.)

    Correct! 
    Wrong! 

    2 condoms have 4 surfaces (one per person).

  1. Hanging Chain

    You have a 6-foot long chain that is suspended at its ends, tacked to a wall. The tacks are parallel to the floor. Due to gravity, the middle part of the chain hangs down a little bit, forming a hump; the length of this hump in the vertical direction is 3 feet. Find the distance in between the tacks.

    Correct! 
    Wrong! 

    I hope you know how long half of a 6-foot chain is...

  1. Who Am I?

    I am greater than God, and more evil than the devil. Poor people have me. Rich people want me. And if you eat me, you'll die. What am I?

    Correct! 
    Wrong! 

    What do you know about your garbage man's love life?

  1. Placing Trees

    You are a landscape specialist, and have been asked to design a garden for a math professor. He wants four trees that are all equidistant from each other. How do you place the trees?

    Correct! 
    Wrong! 

    We live in a three dimensional world!

  1. Ice Cream & Urban Riots

    What leads to scientific studies discovering a direct, positive correlation between eating ice cream and the occurrence of massive urban riots?

    Correct! 
    Wrong! 

    Mother nature often plays a part.

  1. Primates

    You walk into a room in which there are three primates: a chimpanzee, an orangutan, and a gorilla. The chimpanzee is holding a banana in each hand, the orangutan is holding a big stick, and the gorilla is holding nothing. Which primate in the room is the smartest?

    Correct! 
    Wrong! 

    Look way back up the family tree.

  1. Taking Pills

    A patient has fallen very ill and has been advised to take exactly one pill of medicine X and exactly one pill of medicine Y each day, lest he die from either illness or overdosage. These pills must be taken together. The patient has bottles of X pills and Y pills. He puts one of the X pills in his hand. Then while tilting the bottle of Y pills, two Y pills accidentally fall out. Now there are three pills in his hand. Because both types of pill look identical, he cannot tell which two pills are type Y and which is type X. Since the pills are extremely expensive, the patient does not wish to throw away the ones in his hand. How can he save the pills in his hand and still maintain a proper daily dosage?

    Correct! 
    Wrong! 

    You'll have tomorrow all sorted out too when this is done.

  1. River Crossing

    Two people come to a river. There is a boat, however it can carry one person only. How can they each get to the other side of the river using the boat?

    Correct! 
    Wrong! 

    Never said where each person came from.

  1. Finding Average

    Three coworkers would like to know their average salary. However, they are self-conscious and don't want to tell each other their own salaries, for fear of either being ridiculed or getting their houses robbed. How can they find their average salary, without disclosing their own salaries?

    Correct! 
    Wrong! 

    Math steps: divide, add, add, and divide again.

  1. Light Bulbs & Switches

    You are in a room with three light switches, each of which controls one of three light bulbs in the next room. Your task is to determine which switch controls which bulb. All lights are initially off, and you can't see into one room from the other. You are allowed only one chance to enter the room with the light bulbs. How can you determine which lightswitch goes with which light bulb?

    Correct! 
    Wrong! 

    What happens to a bulb after it's been on for a while?

  1. Where's The Father

    The mother is 21 years older than the child. In 6 years from now, the mother will be 5 times as old as the child. So, what's the father doing?

    Correct! 
    Wrong! 

    How long do pregnancies last?

  1. Everyday things

    What get wetter the more it dries?

    Correct! 
    Wrong! 

    They come in cloth and paper.

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