Bought 10 kg of mushrooms, the water content is 99%, after drying for a while, the water content is 98%, ask how many kg of water evaporated.
买来蘑菇10千克，含水量为99%，晾晒一会儿后，含水量为98%，问蒸发掉多少千克水分．
<gadget id="calculator">99 / 100</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">1 - (99/100)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/100) / (1/50)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 * (1/2)</gadget>
<output>5</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<result>5</result>