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!

  1. 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.)

    1. Hint To help you play safe
  1. 2. 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.

    1. Hint To help you measure things
  1. 3. 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?

    1. Hint To put things in perspective
  1. 4. 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?

    1. Hint To help you think outside the box
  1. 5. 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?

    1. Hint So you know what to look out for
  1. 6. 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?

    1. Hint To not go bananas
  1. 7. 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?

    1. Hint So you stay properly medicated
  1. 8. 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?

    1. Hint So you don’t get stuck
  1. 9. 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?

    1. Hint So you can know where you stand
  1. 10. 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?

    1. Hint So you don’t expend excess energy
  1. 11. 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?

    1. Hint So you know how it started
  1. 12. Everyday things

    What get wetter the more it dries?

    1. Hint So you can sleep tonight

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