The school newly purchased a batch of desks and chairs, 240 sets have been shipped, and 40% of them have not yet been shipped. How many sets of desks and chairs are there in total?
学校新购一批桌椅，已经运来240套，还剩40%没有运来，这批桌椅共有多少套？
<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>

<result>400</result>