There are 2,800 kilograms of rice in the grain store, which have been sold (2/7), how many kilograms are left over the sold ones?
粮店有2800千克大米，已卖出(2/7)，剩下的比卖出的多多少千克？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">2_800 * (3/7)</gadget>
<output>1_200</output>

<result>1_200</result>