Arpita’s present age is thrice of Shilpa's present age. Three years ago, sum of their age was 50 years. (i) If Shilpa's present age is x, then Arpita's present age will be _______. (ii) Three years ago, sum of their age was 50 years, the equation formed is____________. (iii) Find their present ages. (iii) Who is younger, Arpita or Shilpa and by how many years?
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