Question 1062098
S = number of student tickets
A = number of adult tickets

S+A = 596  (1)
S = A-54    (2)


Subs A-54 for S from (2) , into (1):
(A-54)+A = 596
2A - 54 = 596

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Solve for A then plug in that value into either eqn (1) or (2) to get S.