After the fruit store sells (1/4) of the fruit in stock, it brings in another 180,000 kilograms of fruit. At this time, the fruit in stock is more (1/5) than the original stock.
水果店卖出库存水果的(1/4)后，又运来水果180000千克，这时库存水果比原来库存水果多(1/5)，则原来库存水果有多少万千克．
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">180_000 / (9/20)</gadget>
<output>400_000</output>

<gadget id="calculator">400_000 / 10_000</gadget>
<output>40</output>

<result>40</result>