RAY: Remember the puzzler from last week? You have eight coins, and one is heavier than the other seven. How can you find it on a balance scale in two weighings?

Well, hopefully you learned something from last week's puzzler that will enable you to solve this week's puzzler.

Here it is.

You have 50 coins. One of them is bogus, and heavier than the other 49. You have the same balance scale that you used to solve last week's puzzler.

You can figure out which coin is bogus in four weighings. The question is, how?

[ Car Talk Puzzler ]