Most drop towers require child riders to exceed a minimum height; limits vary widely depending upon the nature of the tower, with a 30-foot (9 m) tower for smaller children from 37 inches (95 cm) tall, and a 115-foot (35 m) tower having a 51-inch (130 cm) restriction.
How many sheet of copy paper equal an inch? Using good quality 24 pound paper, a one inch thick stack is about 215 sheets. Using the more common 20 pound paper - popular in schools - one inch is about 250 sheets. Edit
In general, fine business papers, printer papers and personal stationery range in weight from 20 lb. to 32 lb. The most common paper weight today is 20 lb. One rule of thumb to follow is: The heavier the basic weight, the thicker the sheet. The thicker the sheet, the more impressive it feels.