Kobayashi's weight is 40 kg, which is twice the weight of his younger brother, and his father's weight is four times that of his younger brother. What is the weight of his father in kilograms?
小林体重40千克，是弟弟体重的2倍，而爸爸的体重是弟弟的4倍，那么爸爸的体重是多少千克
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>