A bottle of vinegar weighs 500 grams, how many kilograms does 4 bottles of vinegar weigh?
一瓶醋重500克，4瓶醋重多少千克
<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>