According to experiments, the survival rate of a kind of sapling is between 70% and 85%. If 595 saplings are to be guaranteed to survive, then at least how many saplings should be planted.
经实验，一种树苗的成活率在70%～85%之间，如果要保证成活595棵，那么至少要栽多少树苗．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">595 / (7/10)</gadget>
<output>850</output>

<result>850</result>