This year, there are 280 households in Wangcun who own cars, which is 2/5 more than last year. How many households in Wangcun own cars last year?
今年王村拥有轿车的家庭有280户，比去年增加了(2/5)，去年王村有多少户家庭拥有轿车？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">280 / (7/5)</gadget>
<output>200</output>

<result>200</result>