Xiao Ming blows soap bubbles once a minute, exactly 60 bubbles each time. After the soap bubbles are blown out, half of them remain unbroken after one minute, (1/20) remain unbroken after two minutes, and all soap bubbles burst after two and a half minutes. When Xiao Ming blows out 60 new soaps for the twelfth time, how many soap bubbles are there that are not broken?
小明每分钟吹一次肥皂泡，每次恰好吹出60个．肥皂泡吹出之后，经过一分钟还剩一半没有破，经过两分钟还有(1/20)没有破，经过两分半钟肥皂泡全部破了．小明在第12次吹出60个新肥皂的时候，没有破的肥皂泡共有多少个．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/2) + (1/20)</gadget>
<output>31/20 = around 1.55</output>

<gadget id="calculator">60 * (31/20)</gadget>
<output>93</output>

<result>93</result>