The fruit shop brings in 1 ton of fruit and sells 400 kilograms, how many kilograms are left.
水果店运进1吨水果，卖出400千克，还剩多少千克．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<result>600</result>