Among all the contestants in the semi-finals of the mathematics subject competition in grade six, 4 won prizes and 12 did not. What is the winning rate?
在六年级数学学科竞赛复赛的全部参赛者中，4人获奖，12人未获奖，获奖率是多少．
<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>