I believe it to be relevant to the area that you are working. For example a vast majority of the units at the hospital I work at run at a typical ratio of 2 RPNs and 10 RNs per shift. But some floors also run with 11 RPNs and 1 RN all depends on the patient base and level of acuity. I work in the operating room as an OR Tech/RPN and there is 1 RPN to every running room as we are the scrub nurses for the unit. To hospitals at least in my region RPNs are crucial because we can manage the predictable/stable patient load at a much lower cost.