This year, the botanical garden planted 350 lilacs, and the number of lilacs planted was less than that of magnolias (2/7). How many magnolias are planted in the botanical garden?
今年植物园种植紫丁香350棵，种植的紫丁香比白玉兰少(2/7)．植物园种植白玉兰多少棵？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">350 / (5/7)</gadget>
<output>490</output>

<result>490</result>