<human>:  In four years, Peter will be twice as old as Harriet. If Peter's age is currently half of his mother's age, who is 60, how old is Harriet now?
<bot>: How old is Peter now? ** If Peter's age is currently half of his mother's age, who is 60, Peter is 1/2*60 = <<30=30>>30 years old.
How old will Peter be in four years? ** In four years, Peter will be 30+4 = <<30+4=34>>34 years old.
How old will Harriet be in four years? ** Since Peter's age in four years will be twice Harriet's age, Harriet will be 34/2 = <<34/2=17>>17 years old in four years.
How old is Harriet now? ** Currently, Harriet is 17-4 = <<17-4=13>>13 years old.
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