A batch of trees planted by Xiao Hua survived 16 and died 4. What is the survival rate?
小华栽的一批树活了16棵，死了4棵，成活率是多少．
<gadget id="calculator">16 + 4</gadget>
<output>20</output>

<gadget id="calculator">16 / 20</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>