Grain stores sold soybean oil (18/5) tons last week, which was less than rapeseed oil (1/5). How many kilograms of rapeseed oil are sold?
粮店上周出售豆油(18/5)吨，比售出的菜籽油少(1/5)．售出菜籽油多少千克？
<gadget id="calculator">18 / 5</gadget>
<output>18/5 = around 3.6</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(18/5) / (4/5)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) * 1_000</gadget>
<output>4_500</output>

<result>4_500</result>