<human>:  Markus is twice the age of his son, and Markus's son is twice the age of Markus's grandson. If the sum of the ages of Markus, his son, and his grandson is 140 years, then how many years old is Markus's grandson?
<bot>: Define a variable ** Let "x" be the age of Markus's grandson.
How old is Markus's son? ** If Markus's son is twice the age of Markus's grandson, then Markus's son is 2*x.
How old is Markus? ** If Markus is twice the age of his son, then Markus is 2*2*x.
Write an equation ** Therefore, if the sum of the ages of Markus, his son, and his grandson is 140 years, then x+(2*x)+(2*2*x)=140 years.
Simplify ** Simplifying the equation, we see that 7*x=140 years.
How old is Markus's grandson? ** Therefore, the age of Markus's grandson is x=20 years old.
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