Birthday !!!Math brain teasers require computations to solve.
Daniel, my son, is exactly one fifth of my age. In 21 years time, I will be exactly twice his age. My wife is exactly seven times older than my daughter, Jessica. In 8 years time, my wife will be three times older than Jessica. How old are Daniel and Jessica now?
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hard one though.... im not much of a thinker. lol 
