Uncle Wang planted trees, 38 survived, and 2 failed. What is the survival rate?
王大爷植树，成活了38棵，有2棵没成活，成活率是多少．
<gadget id="calculator">38 + 2</gadget>
<output>40</output>

<gadget id="calculator">38 / 40</gadget>
<output>19/20 = around 0.95</output>

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

<gadget id="calculator">(19/20) * 1</gadget>
<output>19/20 = around 0.95</output>

<result>19/20 = around 0.95</result>