Question 1126077
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mrs tan is 28 years old older than zack.
he's 4 years younger than mrs tan.
all three of them has a total age of 84 years old.
what is mrs tan age?
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There is not "three" of anybody clearly described.  There are only TWO people, Mrs. Tan, and Zack.  One of those Mrs.  needs to be changed into a Mr.  THEN the description will make sense.