The volume of ice turned into water is reduced by 10%. Put 9 liters of water in the refrigerator, what is the volume after freezing
冰化成水体积要减少10%．把9升水放进冰箱，结成冰后的体积是多少
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">9 / (9/10)</gadget>
<output>10</output>

<result>10</result>