Hi,

Let x represent long sleeve then (36-x) is the number of shortsleeved    

 18x + 12(36-x) = $522

       6x = 522 - 12*36

       6x = 522 - 432

        6x = 90

         x = 15, number of short sleeved.  21 long leveed shirts    

CHECKING our answer***

 = $522

Wish You the Best in your Studies.



 

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