There are 140 species of ginkgo trees found in China, less than the total number of ginkgo species in the world (1/3). How many species of ginkgo trees are there in the world?
在中国发现的银杏树有140种，比全世界的银杏树种总数少(1/3)．全世界的银杏树种有多少种？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">140 / (2/3)</gadget>
<output>210</output>

<result>210</result>