Posts Tagged ‘math brain teaser’

Best Brain Teasers. Part 2.

Tuesday, August 27th, 2013

To the nearest tenth of a percent, what percentage of positive integers have a “7” as at least one of the digits?

Best Brain Teasers. Part 1.

Monday, August 26th, 2013

Fred MacMurray is introduced to a man who claims to be a genius. He decides to test his claim. Fred says to the genius: “I am going to tell you some facts about my 3 sons and as soon as you knows their ages, stop me.” The genius says: “Sounds good. Go ahead.” (more…)