Xiaogang's weight is 40 kg, and his weight is lighter (1/2) than his father's weight. How much is Xiaogang's father's weight in kilograms?
小刚的体重是40千克，他的体重比爸爸的体重轻(1/2)，小刚爸爸的体重是多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / (1/2)</gadget>
<output>80</output>

<result>80</result>