A bag of salt weighs 500 grams, what is the weight of 4 bags of the same salt?
一袋盐重500克，4袋同样的盐重多少千克．
<gadget id="calculator">4 / 1_000</gadget>
<output>1/250 = around 0.004</output>

<gadget id="calculator">500 * (1/250)</gadget>
<output>2</output>

<result>2</result>