Question 393250
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Hi
there are 540 workers 
Let x and (540 - x) represent the number of techs and packers respectively
Question States
 $24x + $20(540-x) = $12,000
solving for x
       4x = $12,000 - $20*540
        4x = 1200
         x = 300, the number of techs.  240 packers.  (540-300)

CHECKING our Answer
 $24*300 + $20 *240 = $12,000