Xiao Ming blows bubbles once every minute, 100 at a time. After 1 minute, half of the blown bubbles burst, and there is still (1/20) left in 2 minutes, and they are all burst in 2 and a half minutes. When Xiao Ming blows out 100 times, is there a total of How many bubbles to burst?
小明每分钟吹一次泡泡，一次吹100个，吹出的泡泡经过1分钟有一半破灭，2分钟还剩下(1/20)，2分半钟全部破灭，小明吹出100次时，共有没有破灭的泡泡多少个？
<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">100 * (31/20)</gadget>
<output>155</output>

<result>155</result>