context: The two ancient rulers who first used large-scale siege engines were Philippos II of Macedonia and Alexander the Great. Their large siege machines triggered an evolution that led to impressive machines, such as the Demetrios Poliorketes Helepolis (or "Conqueror of the City") in 304 BC. The device has a height of nine floors and is coated with iron, its height rises to 40m (125ft) and is 21m wide, while its weight reaches 180 tons (360,000lb). The most widely used siege engine is obviously a ram collector, or turtle, which is deployed in a number of skilled ways that allow attackers to reach walls or trenches with a certain degree of safety. For siege or sea battles a machine like a seesaw (sambykē or sambuka) was once used. This tool is a giant ladder that is hinged and mounted on a mechanical support and is used to move the soldiers from the ship to the city wall in the coastal area. This tool is usually placed on two or more ships tied together and some sambykē is protected with a shield at the top to protect the climbers from arrow attacks. Other machines are used to seize enemy equipment or even enemy soldiers with opposing attachments which are probably the origin of the corvus machine developed by Roman troops. Other weapons drop heavy objects on enemy troops.
question: How much does a siege machine weigh?
answers.text: 180 tons