50/50

Then the old man poured half of the soft drink into the extra cup and set that in front of his wife. The old man then began to eat, and his wife sat watching, with her hands folded in her lap.

The young man decided to ask if they would allow him to purchase another meal for them so that they didn't have to split theirs.

The old gentleman said, "Oh, no. We're old. This is plenty for us. Besides, we've been married 50 years, and everything has always been and will always be shared, 50/50."

The young man then asked the wife if she was going to eat her share, and she replied, "Not yet. This time he gets the first turn with the teeth."