Question 1146770
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Let x = for each shirt;

    y = for each pair of slacks,  and

    z = for each sport coat.


Then from the condition you have this set of 3 equations in 3 unknowns


    2x + 2y + 0z = 11.96          (1)

    6x + 3y + 2z = 35.39          (2)

    5x + 0y + 2z = 20.43.         (3)



It can be solved using Substitution, or Elimination, or determinants (the Cramer's rule).



Or, if you are a lazy person, you may use online (free of charge) solver 

http://matrix.reshish.com
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