The volume of ice that turns into water decreases (9/100), then how much does the volume of water turn into ice increase? (fraction)
冰化成水体积减少(9/100)，那么水结成冰体积要增加多少．(几分之几)
<gadget id="calculator">9 / 100</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">1 - (9/100)</gadget>
<output>91/100 = around 0.91</output>

<gadget id="calculator">1 - (91/100)</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">(9/100) / (91/100)</gadget>
<output>9/91 = around 0.098901</output>

<result>9/91 = around 0.098901</result>