After selling 40% of a batch of salad oil, there are 240 bottles left, how many bottles are sold?
一批色拉油卖掉40%后，还剩下240瓶，卖掉多少瓶？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<gadget id="calculator">400 - 240</gadget>
<output>160</output>

<result>160</result>