Xiaofeng puts 12 red glass balls, 5 blue glass balls and 8 green glass balls into a paper bag, and randomly takes out a glass ball from the paper bag. The probability of taking out the green glass ball is ((())/(( ))).
小峰将12个红玻璃球、5个蓝玻璃球和8个绿玻璃球放入一个纸袋里，任意从纸袋里取出一个玻璃球，取出绿玻璃球的可能性是((())/(()))．
<gadget id="calculator">12 + 5 + 8</gadget>
<output>25</output>

<gadget id="calculator">8 / 25</gadget>
<output>8/25 = around 0.32</output>

<result>8/25 = around 0.32</result>