It is known that the weight of the fish tail is 4 kg, and the weight of the fish head is equal to the sum of the weight of the fish tail plus half of the fish body, and the weight of the fish body is equal to the sum of the weight of the fish head plus the tail. How many kilograms does this fish weigh?
已知鱼尾重4千克，而鱼头重量等于鱼尾加鱼身一半的重量和，鱼身重量等于鱼头加鱼尾的重量和．这条鱼重多少千克？
<gadget id="calculator">12 + 4</gadget>
<output>16</output>

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

<result>32</result>