Yao Nongxin collected 24 kilograms of medicinal materials with a moisture content of 85%, and after drying, the moisture content of the medicinal materials was only 10%. How many kilograms are the dried medicinal materials?
药农新采集了24千克含水率为85%的药材，经过烘干后药材含水率仅为10%，经过烘干的药材质量为多少千克？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<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">(3/20) / (9/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">24 * (1/6)</gadget>
<output>4</output>

<result>4</result>