There are 420 households with cars in a community this year, an increase of (1/5) compared with last year. How many households in this community owned cars last year? (solution by equation)
某小区今年拥有小汽车的家庭有420户，比去年增加了(1/5)，去年该小区有多少户家庭拥有小汽车？(用方程解)
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">420 / (6/5)</gadget>
<output>350</output>

<result>350</result>