Respuesta :

The problem statement tells us ...
  16 cm = 2.5 cm + (1/4)*(large gear diameter)

We can subtract 2.5 cm and multiply by 4 to find the large gear diameter.
  13.5 cm = (1/4)*(large gear diameter)
  54 cm = (large gear diameter)

The diameter of the larger gear is 54 cm.

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