Class 1 of the third grade selected 19 students to test their weight. Their average weight is 45 kg. What is their total weight in kg?
三年级1班抽19名同学测试体重，他们的平均体重是45千克，他们的总体重量是多少千克．
<gadget id="calculator">45 * 19</gadget>
<output>855</output>

<result>855</result>