Question 860941
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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    {{{36-15}}}
CHECKING our answer***
{{{18*15 + 12*21}}} = $522
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