How many 20pences can you fit in a smarties tube?

A standard Smarties tube is approximately 4.5 inches tall and 1 inch in diameter. A 20 pence coin has a diameter of about 2.1 centimeters (0.83 inches). Given these dimensions, you can fit around 40 to 45 twenty pence coins in a Smarties tube, depending on how tightly they are stacked.