A certain kind of wild mushroom has either spots or gills, but never both. Gilled mushrooms are rare, with only one growing for every nine spotted mushrooms that grow. A fallen log had 30 mushrooms growing on its side. How many gilled mushrooms were on the fallen log’s side?
There is 1 gilled mushroom for every 1 + 9 = <<1+9=10>>10 mushrooms.
Thus, there were 30 / 10 = <<30/10=3>>3 gilled mushrooms on the fallen log’s side.
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