The survival rate of a kind of saplings after trial planting is 95%, in order to ensure 380 saplings survive, at least how many saplings should be planted.
一种树苗经试种成活率是95%，为保证成活380棵，至少应种多少棵．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">380 / (19/20)</gadget>
<output>400</output>

<result>400</result>