There are 4,000 kilograms of rice in the warehouse of a grain station, 3/10 of the total sold in January, and 35% of the total 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35%，还剩下多少千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (3/10) - (7/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">4_000 * (7/20)</gadget>
<output>1_400</output>

<result>1_400</result>