A carload of apples weighs 350 kilograms. After selling 2 carloads, how many kilograms are left is 1 ton.
一车苹果重350千克，卖了2车后，还差多少千克是1吨．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">350 * 2</gadget>
<output>700</output>

<gadget id="calculator">1_000 - 700</gadget>
<output>300</output>

<result>300</result>