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Feb 2nd, 2012
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  1. Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?
  2.  
  3. (Jane - 4) = 2Sam
  4. (Jane + 4 * 3/4) = Sam
  5.  
  6. 3/4Jane + (4 * 3/4) = Sam
  7. 3/4Jane + 3 = Sam
  8.  
  9. Jane - 4 = 2(3/4Jane + 3)
  10. Jane - 4 = 3/2Jane + 6
  11. Jane = 3/2Jane + 10
  12. 0 = 1/2Jane + 10
  13. 1/2Jane = -10
  14. Jane = -20
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