Aunt Liu uses 3 kilograms of wool to make wool balls. Each wool ball requires (1/20) kilograms of wool, and Aunt Liu has already used (4/5) of wool. How many yarn balls has Aunt Liu made?
刘阿姨用3千克毛线做绒线球，每个绒线球需用毛线(1/20)千克，刘阿姨已经用了毛线的(4/5)．刘阿姨已经做完了多少个绒线球？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(4/5) / (1/20)</gadget>
<output>16</output>

<gadget id="calculator">3 * 16</gadget>
<output>48</output>

<result>48</result>