Thursday, September 3, 2009

Traveling Ant

Here is one of numerous Gardner puzzles:

Imagine elastic rope 1 meter long, an ant start moving with speed of 10 centimeters per second from one end of the rope. He moves steadily with constant speed. Every second someone stretches the rope to increase it's length by 1 meter uniformly. Will ant ever make it to the other end of the rope?

this one is rather interesting, try to prove your answer!

Tuesday, September 1, 2009

Alive and kicking

Got distracted with work, travel and life as usual but fear not this blog isn't dead I still collect interesting problems. Without further ado:

You have four numbers: 3,3,3,3 (four threes) using simple operations such as +, -, *, /, (addition, subtraction, devision and multiplication) produce expressions that result in numbers from 0 to 10.
For example: 3 / 3 - 3 / 3 = 0.
Note, that you must use all four 3s in each expression. Have fun!

This is very simple and relaxing puzzle that you can solve with your kids and I have tons of fun solving with my eight year old.