A batch of saplings were planted in the school, 15 did not germinate, and the survival rate was 95%, so how many saplings were planted in the school?
学校栽一批树苗，没发芽的有15棵，成活率是95%，那么学校栽了几棵树苗？
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">15 / (1/20)</gadget>
<output>300</output>

<result>300</result>