Lai'an Village planted 120 willows this year, among which were pagoda trees (6/7), and pagoda trees were poplars (2/5). How many poplar trees are planted this year?
来安村今年栽种柳树120棵，是栽种槐树的(6/7)，槐树又是杨树的(2/5)．今年栽杨树多少棵？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (6/7) / (2/5)</gadget>
<output>350</output>

<result>350</result>