Question

You're on a fishing trip with friends and you look over and see a boat filled with people. You look away for a minute then look back at the same boat and yet you don't see a single person on it. Why?

Answer 1

they are Fisher man that's the answer

Answer 2

You can't see any "single" person doesn't mean there is no one there. This means that they all must be "married". None of them are "single". They all are "couples"