There are a total of 72 eggs in the three boxes. If you take 12 eggs from the first box and put them in the second box, and then take 15 eggs from the second box and put them in the third box, then the number of eggs in the three boxes will be exactly equal. Find out how many eggs are in the second box?
三只盒子里一共装有72只鸡蛋．如果从第一只盒子里取出12只鸡蛋放入第二只盒子里，再从第二只盒子里取出15只鸡蛋放入第三只盒子里，那么三只盒子里的鸡蛋数就完全相等．求原来第二只盒子里有多少只鸡蛋？
<gadget id="calculator">72 / 3</gadget>
<output>24</output>

<gadget id="calculator">24 - 12</gadget>
<output>12</output>

<gadget id="calculator">12 + 15</gadget>
<output>27</output>

<result>27</result>