Saturday 26 January 2013

6 Colored balls

We have two red, two green and two yellow balls. For each color, one ball is heavy and the other is light. All heavy balls weigh the same. All light balls weigh the same. How many weighing on a beam balance are necessary to identify the three heavy balls?

Hole and the Board

Cut this board into only 2 pieces so that they fit into the given hole.