$\left[\begin{array}{l}\text { Joke Problems }\end{array}\right]$

An apple floats on water such that $1 / 5$ of the apple is above water, and $4/5$ is below water. Underwater, a fish starts eating the apple at a rate of 120 g/min, while above water, a bird starts eating the apple at a rate of 60 g/min. What part of the apple will go to the fish, and what part will go to the bird?
While the apple has not been completely eaten, part of it will always be above the water, and part will be below the water.

## Solution

While the apple has not been completely eaten, part of it will be above the water, and part will be below the water. Therefore, the fish and the bird will finish eating the apple at the same time. Since the fish eats twice as fast, it will get twice as much.

## Answer

$2 / 3$ - for the fish, $1 / 3$ - for the bird.