Uncle Li originally weighed 80 kilograms, but after exercising, he lost (1/5) of his weight. How many kilograms did Uncle Li lose?
李叔叔原本体重80千克，坚持体育锻炼后，体重减轻了(1/5)，李叔叔体重减轻了多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<result>16</result>