There are 5 tons of apples, and 4000kg are transported away, how many tons of apples are left?
有5吨苹果，运走了4000kg，还剩多少吨苹果？
<gadget id="calculator">4_000 / 1_000</gadget>
<output>4</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<result>1</result>