Uncle Li used to weigh 80 kilograms. After exercising, he lost 1/5 of his weight. How many kilograms does Uncle Li weigh now?
李叔叔原来体重80千克，坚持体育锻炼后，体重减轻了(1/5)，现在李叔叔体重多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 * (4/5)</gadget>
<output>64</output>

<result>64</result>