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Wednesday, January 21, 2015

Brain Teaser 1/22/2015

1. Inside the drawer of a dressing-table in a dark room, there are 28 black socks and 28 brown socks. What is the minimum number of socks that I must take out of the drawer to guarantee that I have a matching pair?

2. Timothy and Urban compete in a car rally, going several times around a closed circuit. Timothy can drive the circuit in 25 minutes, but Urban takes 30 minutes. If the two drivers start at the same time, how long will it take Timothy to lap Urban?
Solution
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