Hi,

Let x and (14-x) represent the number of 60sec and 30sec commmercials respectively

Question states***

 60x + 30(14-x) = 11*60

Solving for x

      30x = 660 - 420

       30x = 240

         x = 8, the number of 60sec.  Six the number of 30sec



CHECKING our Answer***

 8*60 + 6*30 = 480 + 180 = 660sec or 11 min 

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