Coffee and Cream
I was recently reminded of an excellent math problem involving mixtures.
Imagine yourself sitting in front of a cup of coffee and a cup of cream.
Suppose you take a spoonful of cream, pour it into the coffee, and stir it up. Now once that’s thoroughly mixed, you take a spoonful of the mixture and pour it back into the cream. Then you mix that up. After all of this, is there more coffee in the cream, more cream in the coffee, or equal amounts in both?
I encourage you to think about the problem before perusing the several solutions below!
- Coffee and Cream — A Straightforward Solution
- Coffee and Cream — An Elegant Solution
- Coffee, Cream, and Making a Wish