There are 100 kilograms of green grass with a water content of 66%, and the water content drops to 15% after drying. How much does the grass weigh in kilograms after drying?
有100千克青草，含水量为66%，晾晒后含水量降到15%．这些青草晾晒后重多少千克．
<gadget id="calculator">66 / 100</gadget>
<output>33/50 = around 0.66</output>

<gadget id="calculator">1 - (33/50)</gadget>
<output>17/50 = around 0.34</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">(17/50) / (17/20)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 * (2/5)</gadget>
<output>40</output>

<result>40</result>