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• a , b are the numbers of $21 and $27 tickets. a + b = 30 21a + 27b = 696 - 27a - 27b = -810 21a + 27b = 696 -6a = -114 a = 19

  in algebra word problem, 10 p0ints!? Comment by molly-turner_60c035733bb92 June 2021