Riddles and Logical Puzzles

(1) A man was looking at a portrait. Someone asked him, "Whose picture are you looking at?" He replied:"Brothers and sisters have I none, but this man's father is my father's son."

Whose picture was the man looking at?

(2)Suppose, in the above situation, the man had instead answered:"Brothers and sisters have I none, but this man's son is my father's son."

Now whose picture is the man looking at?

(3)A man lived on the twenty-fifth floor of a thirty-story apartment building. Every morning (except Saturdays and Sundays) he got into the elevator, got off at the ground floor, and went to work. In the evening, he came home, got into the elevator, got off at the twenty-fourth floor, and walked up one flight.

Why did he get off at the twenty-fourth floor instead of the twenty-fifth?

(4)If a teacher and a half can eat a pizza and a half in a day and a half, how many pizzas can a dozen teachers eat in 3 days?

(5)If Jeff had only one match and he entered a cold room in which there were a kerosene lamp, an oil heater, and a wood-burning stove, which should he light first?

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