Xiao Min's weight is 30 kg, which is 3/5 of his brother's weight, and his brother's weight is 5/7 of his father's weight. How many kilograms does his father weigh?
小敏的体重是30千克，是哥哥体重的(3/5)，哥哥的体重是爸爸体重的(5/7)，爸爸的体重是多少千克？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">30 / (3/5) / (5/7)</gadget>
<output>70</output>

<result>70</result>