What is the total weight of 5 bags of melon seeds weighing 400 grams?
5袋重400克的瓜子共重多少千克．
<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">400 * (1/200)</gadget>
<output>2</output>

<result>2</result>