The weight of the tail of a fish is 4 kg. The weight of the head is equal to the weight of the tail plus half of the body. The weight of the body is equal to the head plus the tail. What is the weight of this fish?
鱼尾重4千克，鱼头的重量等于鱼尾加躯干的一半，躯干的重量等于鱼头加鱼尾，这条鱼重多少千克．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">4 + 16 + 12</gadget>
<output>32</output>

<result>32</result>