Xiaohui planted a batch of saplings, 18 of which survived and 2 died. What is the survival rate of these saplings?
小辉栽了一批树苗，活了18棵，死了2棵．这批树苗的成活率是多少．
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>