Question 1152424
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Let n be that "equal numbers" under the question.


Then you have this equation to find "n"


    1.80n - 1.50n = 108.


Simplify and solve


   0.3n = 108

      n = {{{108/0.3}}} = {{{1800/3}}} = 600.    


<U>ANSWER</U>.  {{{600/12}}} = 50 dozen of each brand.
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