100 trees were planted on Arbor Day in Class 1, and 20 died. What is the survival rate of these trees?
三1班植树节共栽树100棵，有20棵死亡，这批树的成活率是多少．
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">80 / 100</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>