<human>:  Jeff is 10 years older than his younger sister, Martha. Martha, on the other hand, is 4 years younger than her boyfriend, Mike. If Mike is 24 years old, how old is Jeff?
<bot>: How old is Martha? ** Martha is 24 - 4 = <<24-4=20>>20 years old.
How old is Jeff? ** Jeff is 20 + 10 =<<20+10=30>>30 years old.
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