6,000 kilograms of fruit are shipped from the city, and 4 tons are sold. How many tons of fruit are left?
市运来6000千克水果，卖了4吨，还剩多少吨水果？
<gadget id="calculator">6_000 / 1_000</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<result>2</result>