June 11th, 2014, 11:44 AM  #11 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
4 circles; this way, touching each other: 00 00 
April 16th, 2015, 03:39 PM  #12 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs 
I was able to quickly solve it the last time it made the rounds, but I did have the benefit of actually seeing the image and question that went with it... 

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