In one glass, there was milk, and in the other, an equal amount of coffee.
A spoonful of milk was transferred from the milk glass to the coffee glass and then stirred.
Subsequently, the same spoonful of the resulting mixture was returned to the milk glass.
What is more now: the coffee in the milk glass or the milk in the coffee glass?
They have the same amount!
After the second transfusion, there is exactly as much coffee in the glass of milk as the amount of milk that was taken from it: after all, the volume of liquid has not changed. This means that in the end there is as much coffee in milk as there is milk in coffee.
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