First Day Math Puzzle
Here’s a math puzzle that my son’s geometry teacher had them work on today, his first day of high school:
There are 75 white beans and 150 black beans in a jar, and another large pile of black beans outside of the jar. A person reaches into the jar and chooses 2 beans at random.
- If they are both black, keep one out, and put one back in
- If there is one of each color, keep the black one out and put the white one back in
- If they are both white, keep them both out
What will the color of the last bean left in the jar be?
(No, it has nothing to do with geometry. I guess it was just problem solving practice, and practice with using a certain format to write up problem solutions. I had seen the problem before, but had forgotten about it.)