You have four lengths of gold chain. One is made up of five links, two are made of four links, and one made of three links. These need to be made into one bracelet. The jeweler you have taken them to charges 50 cents to break a link and $1.00 to weld a link back together. You figure it would cost $6.00, but the jeweler finds a cheaper way. What is it and how much will it cost?
It will only cost $4.50 if you do this: break all the links on the three-link chain and use those to attach all the other three together.
Today's brain teaser courtesy of Braingle.com.