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At Agilist's request, I'm posting 3 more riddles:
#21 A man had a square window in his house, with an area of 1 square meter.
But he decided that there was too much light in the room and covered half of the window so that it remained square (height 1 meter, width 1 meter). How is this possible?
#22
Two mathematicians met after many years. The first: "I have three sons."
The second: "How old are they?"
The first: "The product of their ages is 36."
The second: "This information is not enough."
The first: "The sum of their ages is equal to the number of your house."
The second: "This information is still not enough for me."
The first: "My eldest son has red hair." This time, B named the age of all the children. How old is each of them?
#23 The diameter of a deep, round lake is 200 meters; in the middle of the lake is an island with a tree growing on it. There is also a tree on the shore. A man wants to get from the shore to the island; he cannot swim, but he has a rope that is slightly longer than 200 meters. How can he get to the island using the rope?
#21 A man had a square window in his house, with an area of 1 square meter.
But he decided that there was too much light in the room and covered half of the window so that it remained square (height 1 meter, width 1 meter). How is this possible?
#22
Two mathematicians met after many years. The first: "I have three sons."
The second: "How old are they?"
The first: "The product of their ages is 36."
The second: "This information is not enough."
The first: "The sum of their ages is equal to the number of your house."
The second: "This information is still not enough for me."
The first: "My eldest son has red hair." This time, B named the age of all the children. How old is each of them?
#23 The diameter of a deep, round lake is 200 meters; in the middle of the lake is an island with a tree growing on it. There is also a tree on the shore. A man wants to get from the shore to the island; he cannot swim, but he has a rope that is slightly longer than 200 meters. How can he get to the island using the rope?