Plant a batch of saplings, and the survival rate is 90%. In order to ensure that 360 saplings are planted alive, at least how many saplings should be planted.
栽一批树苗，成活率为90%，为保证栽活360棵，至少要栽树苗多少棵．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">360 / (9/10)</gadget>
<output>400</output>

<result>400</result>