CAUTION: ANSWERS DISCUSSED BELOW. USE YOUR BRAIN AND DO NOT READ PAST THIS POINT UNTIL YOU FIGURE IT OUT.
This problem can be solved to answer the question exactly as it is stated, and the answer is provable.
We were given this problem as part of an Ed. Psy. class. It wasn't graded, it was just to get us thinking. I didn't get it because I was thinking about the problem the wrong way.
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A conversation took place between two friends, a philosopher and a mathematician, who had not seen or heard from one another in years. The mathematician, who had exceedingly good memory, asked the philosopher how many children he had. The philosopher replied that he had three. The mathematician then asked how old the children were. His friend, who knew how much mathematicians enjoy puzzles, said he would give a number of clues to his children's ages.
The philosopher's first clue: "The product of the children's ages is 36." The mathematician immediately replied that this was insufficient information. The philosopher's second clue: "All of the children's ages are integers, none are fractional ages, e.g., 1 1/2 years old." Still the mathematician could not deduce the correct answer.
The philosopher's third clue: "The sum of the children's ages is identical to the address of the house where we played chess together often, years ago." The mathematician still required more information. The philosopher then gave his fourth clue: "The oldest child looks like me." At this point, the mathematician was able to determine the ages of the three children.
This is the problem: What were their ages and what was the mathematician's reasoning?