There were 30 bricks, and the two brothers competed to pick them out. The younger brother rushed to the front. Just after the bricks were placed, the older brother arrived. The older brother saw that the younger brother had picked too many bricks, so he grabbed half of them. The younger brother refused to take half from the elder brother. The elder brother refused to accept, so the younger brother had to give the elder brother 4 yuan. At this time, the elder brother had the same amount as the younger brother, and asked the younger brother how many bricks he planned to pick at first.
有30块砖，兄弟二人争着去挑，弟弟抢在前面，刚刚摆好砖，哥哥赶到了，哥哥看弟弟挑的太多，就抢过一半，弟弟不肯又从哥哥那儿抢走一半，哥哥不服，弟弟只好给哥哥4块，这时哥哥和弟弟一样多，问最初弟弟准备挑多少块砖．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<gadget id="calculator">30 - 22</gadget>
<output>8</output>

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

<result>16</result>