The elder brother's weight is 40kg, and Xiaoli's weight is her elder brother's (4/5) and her father's (1/2), how much is her father's weight in kg?
哥哥的体重是40kg，小丽的体重是哥哥的(4/5)，又是爸爸的(1/2)，爸爸的体重是多少kg？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<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">(4/5) / (1/2)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">40 * (8/5)</gadget>
<output>64</output>

<result>64</result>