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Sorry for the bad English.
Two mathematicians are talking.
The first one says: I remember you had three sons; how old are they now?
The second one: If I multiply their ages, the result is 36
First one: This is not enough for me to tell the ages.
Second: If I add their ages, the result is the age of YOUR son.
First: I have only one son, I know his age, but this is not enough yet to tell the ages of your sons.
Second: The older one is attending piano lessons.
First one: OK, now I can tell the ages.
Questions:
- what are the ages of the three sons of the second man?
- what is the age of the son of the first man?
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