<human>:  Rachel is 4 years older than Leah. If the sum of their ages is 34, how old is Rachel?
<bot>: How old are Rachel and Leah? ** If Rachel and Leah have the same age, then the sum of their ages would be 34 - 4 = <<34-4=30>>30.
How old is Leah? ** So Leah would be 30/2 = <<30/2=15>>15 years old.
How old is Rachel? ** Hence, Rachel is 15 + 4 = <<15+4=19>>19 years old.
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