The fruit shop has shipped in 1 ton of watermelon and sold 880 kilograms. How many kilograms are left?
水果店运进1吨西瓜，已经卖出880千克，还剩多少千克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 880</gadget>
<output>120</output>

<result>120</result>