Planting a kind of saplings has a survival rate of 95%. In order to ensure that 475 saplings are planted alive, at least how many saplings should be planted.
栽一种树苗，成活率为95%，为了保证栽活475棵，至少要栽树苗多少棵．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">475 / (19/20)</gadget>
<output>500</output>

<result>500</result>