The Young Pioneers planted a batch of saplings, which have already been planted (2/5), and there are 420 left unplanted. How many saplings are there in this batch?
少先队员种一批树苗，已经种了(2/5)，还剩420棵没有种，这批树苗有多少棵？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">420 / (3/5)</gadget>
<output>700</output>

<result>700</result>