An oak tree is 6 times as old as a pine tree and an elm tree is 6 years younger than the oak tree. In 3 years, the age of the elm will be 3 times the age of the pine. How old is the oak tree now?

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Fangju Fangju answered
Set the pine tree is x years old, then the oak tree is 6x years old, the elm tree is 6x-6 years old.
6x-6+3=3(x+3), 3x=12,x=4, 6x+3=27 years old.

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