The students planted 50 trees in the park, and 5 of them failed to survive. What is the survival rate of the trees planted?
同学们在公园里栽了50棵树，有5棵未成活，栽树成活率是多少．
<gadget id="calculator">50 - 5</gadget>
<output>45</output>

<gadget id="calculator">45 / 50</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>