1 worker [tex]=x[/tex]
2 worker [tex]= \frac{worker1}{2}= \frac{x}{3}[/tex]
3 worker [tex]= \frac{worker1}{3}= \frac{x}{3}[/tex]
so:
[tex]66=x+ \frac{x}{3}+ \frac{x}{2} [/tex]
[tex]66=x+\frac{2x}{6}+ \frac{3x}{6} [/tex]
[tex]66*6=6x+2x+3x[/tex]
[tex]396=11x[/tex]
[tex]x=36[/tex]
so:
worker [tex]1[/tex] sorted [tex]36[/tex] boxes
worker [tex]2[/tex] sorted [tex]18[/tex] boxes
worker [tex]3[/tex] sorted [tex]12[/tex] boxes