A commercial station brings in a batch of brown sugar, sells 250 kg on the first day and 200 kg on the second day, and just sells (1/4) of this batch of brown sugar in two days, how many kg is this batch of brown sugar?
某商站运进一批红糖，第一天卖出250千克，第二天卖出200千克，两天正好卖出了这批红糖的(1/4)，这批红糖有多少千克？
<gadget id="calculator">250 + 200</gadget>
<output>450</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">450 / (1/4)</gadget>
<output>1_800</output>

<result>1_800</result>