There are 4,000 kilograms of rice in the warehouse of a grain station. (3/10) of the total was sold in January, and (1/5) of the total was sold in February. How many kilograms are left?
一个粮站的仓库里存有大米4000千克，一月份卖出总数的(3/10)，二月份卖出总数的(1/5)，还剩下多少千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/10) + (1/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4_000 * (1/2)</gadget>
<output>2_000</output>

<gadget id="calculator">4_000 - 2_000</gadget>
<output>2_000</output>

<result>2_000</result>