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January 26, 2011

IQ puzzle

Find a number such that when you rotate the number to the left,
the new number is 1.5 times the original number.

To rotate the number left, move the first digit to the last place
of the number like 75837 rotated to the left is 58377)

January 13, 2011

Climbing Snail

A snail is at the bottom of a 20 meters deep pit. Every day
the snail climbs 5 meters upwards, but at night it slides
4 meters.

The Question: How many days does it take before the snail
reaches the top of the pit?

January 4, 2011

Crazy guy on the airplane

People are waiting in line to board a 100-seat airplane.
Steve is the first person in the line. He gets on the plane
but suddenly can't remember what his seat number is, so he
picks a seat at random. After that, each person who gets on
the plane sits in their assigned seat if it's available,
otherwise they will choose an open seat at random to sit in.

The flight is full and you are last in line. What is the
probability that you get to sit in your assigned seat?