There are 6 units in a building, and 18 families live in each unit. How many families live in this building?
一栋楼房一共6个单元，每个单元住着18户人家，这栋楼房共住了多少户人家？
<gadget id="calculator">18 * 6</gadget>
<output>108</output>

<result>108</result>