batch of fruit was sold out in four days, 180 kg was sold on the first day, the rest (2/7) was sold on the second day, and half of this batch of fruit was sold on the third and fourth days. How much is this batch of fruit? kilogram.
一批水果用了四天卖完，第一天卖出180千克，第二天卖出余下的(2/7)，第三、四天共卖出这批水果的一半，这批水果有多少千克．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">180 * (2/7)</gadget>
<output>360/7 = around 51.428571</output>

<gadget id="calculator">180 - (360/7)</gadget>
<output>900/7 = around 128.571429</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) - (2/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">(900/7) / (3/14)</gadget>
<output>600</output>

<result>600</result>