How do you find how many jelly beans are in a computer room using a measuring cup wateer bottle a six inch dollar bill and one jelly bean?

Use the six-inch dollar bill to measure the room's volume (half-a-foot at a time). Place the jelly bean in the measuring cup then pour water from the bottle until it is fully submersed. Take note of the water level. Remove the jelly bean then take note of the reduced water level. Subtract one from the other, this will tell you the volume of a jelly bean. Divide this into the room's volume. This will tell you how many jelly beans will fit in the room.