A pack of washing powder is 500 grams, how many kilograms is 6 packs of washing powder?
一包洗衣粉是500克，6包洗衣粉是多少千克．
<gadget id="calculator">6 / 1_000</gadget>
<output>3/500 = around 0.006</output>

<gadget id="calculator">500 * (3/500)</gadget>
<output>3</output>

<result>3</result>