The weight of a cow is about 500 kg, and the weight of four cows is about how many tons.
一头牛的体重约500千克，四头牛约重多少吨．
<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>