Xiao Min's weight is 30 kg, which is 3/4 of his brother's weight, and his brother's weight is 4/5 of his father's weight. How much is his father's weight in kilograms?
小敏的体重是30千克，是哥哥体重的(3/4)，哥哥的体重是爸爸体重的(4/5)，爸爸的体重是多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 / (3/4) / (4/5)</gadget>
<output>50</output>

<result>50</result>