Brain Teasers
Take a break for a moment and stretch your brain! Below are a few moderately challenging
brain-teasers and lateral thinking puzzles for your mental break.
This section is updated with new challenges. If you have questions or a "challenge" you would
like to contribute (and get credit for), please send it to us (with the solution) to
info@c2c-solutions.com
.
The Marble Challenge: (Contributed by Daniel Sac from Beverly, MA) In Figure 1 below, there are 5 containers, all full of marbles. Only one of the jars is full of 9 gram
marbles, the rest of the jars are full of 10 gram marbles. All the marbles look and feel alike. You
have only 1 weighing (reading) on a digital scale to determine which of the containers holds the
9 gram balls. This can be done, do you know how? Remember you only get 1 reading on the
scale.
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Brain Teasers
The Magic Triangle:
In figure 2 below, both the top and bottom figures have exactly the same 4 elements in it. The identical parts are moved around to form the bottom figure, but mysteriously there is a
newly formed "hole". Where does the hole come from? Isn't it mathematically and
geometrically impossible? Note: There is a perfectly logical and rational explanation for the
hole. No tricks here.
2/4
Brain Teasers
Are you thinking straight? 5 questions:
1. Mary’s father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. What is the name of
the fifth daughter?
2. What is the next letter in the following sequence? W, I, T, N, L, I, T, F, ?
3. What number written in English capital letters with all straight lines, represents the
number of segments it contains? For example, FIVE, which does not describe itself, contains
10 segments?
4. A boat has a ladder that has six rungs, each rung is one foot apart. The bottom rung is
one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one
hour. When the tide is at it's highest, how many rungs are under water?
5. What is the significance of the following: The year is 1978, the time is thirty-four minutes
past noon on May 6th.
Bruce's 3 dogs: (Contributed by Jeff Clinter from St. Claire, MI)
Brian & Bruce, two brothers that haven't seen each other in a while, are walking down
Westbrook street. They start talking about Bruce's newly aquired "best friends". The
conversation goes like this:
3/4
Brain Teasers
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