Five boxes of duck eggs are shipped from the market. If 12 kilograms are taken out of each box, the remaining duck eggs are equivalent to the weight of the original two boxes. How many kilograms did each box of duck eggs originally weigh?
菜场运来5箱鸭蛋，如果从每箱中拿出12千克，那么剩下的鸭蛋相当于原来两箱的重量，每箱鸭蛋原来重多少千克？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 * (5/3)</gadget>
<output>20</output>

<result>20</result>