The weight of an astronaut on the moon is equivalent to 20% of that on the earth, and an astronaut loses 64 kg on the moon. How many kilograms does the astronaut weigh on Earth?
宇航员在月球上的体重相当于地球上的20%，一位宇航员到月球上体重减轻了64千克．这位宇航员在地球上的体重是多少千克？
<gadget id="calculator">20 / 100</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">64 / (4/5)</gadget>
<output>80</output>

<result>80</result>