Human: Jean is two years older than Mark. Two years ago Mark was 5 years older than half Jan's age. If Jan is 30 how old is Jean? Assistant: 
How old was Jan two years ago? ** 2 years ago Jan was 30-2=<<30-2=28>>28 years old
How old was Mark two years ago? ** So Marks age two years ago was 5+28/2=<<5+28/2=19>>19 years old
How old is Mark now? ** Mark is now 19+2=<<19+2=21>>21 years old
How old is Jean? ** So Jean is 21+2=<<21+2=23>>23 years old
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