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Brain Teaser 1

posted Oct 15, 2011, 6:49 PM by JustBenke   [ updated Oct 30, 2011, 9:10 PM ]
Ever since I was a kid I have loved "tricky questions" and brain teasers. One of my math teachers once told me that every time you solve a new type of problem you add a brand new brain tool, and each new brain tool increases your IQ. The reason is that the next time you see a similar problem, your brain goes and gets the tool it used before and solves the problem. “But remember,” he said. “You need to keep up the maintenance or your tools become rusty and dull. “
What word?
What 7-letter word becomes longer when the third letter is removed?
What has more value, one pound of $10 gold coins or a half pound of $20 gold coins?
The Train
A 100 meter long train moving 100 meter per minute must pass through a tunnel of 100 meter in length. How long will it take?
A bottle partially filled with a liquid. You only have a ruler.
How can you accurately estimate the volume of the bottle?