The survival rate of a kind of sapling experiment is 97%. How many trees should be planted in order to ensure 485 trees survive?
一种树苗试验成活率是97%，为保证成活485棵，至少要种多少棵树？
<gadget id="calculator">97 / 100</gadget>
<output>97/100 = around 0.97</output>

<gadget id="calculator">485 / (97/100)</gadget>
<output>500</output>

<result>500</result>