Summer is coming, a certain school bought 20 air conditioners, the pass rate is 95%, how many air conditioners should the manufacturer prepare for replacement.
夏天来了，某校买了20台空调，合格率为95%，厂家应准备多少台空调以备调换．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

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

<gadget id="calculator">20 - 19</gadget>
<output>1</output>

<result>1</result>