Wangfeng Primary School planted 500 trees, but 15 did not survive. What is the survival rate of these trees?
望风小学植树500棵，有15棵没有成活，这批树的成活率是多少？
<gadget id="calculator">500 - 15</gadget>
<output>485</output>

<gadget id="calculator">485 / 500</gadget>
<output>97/100 = around 0.97</output>

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

<gadget id="calculator">(97/100) * 1</gadget>
<output>97/100 = around 0.97</output>

<result>97/100 = around 0.97</result>