Choose a monitor from 49 students, Xiaohong, Xiaoming and Xiaohua. After counting 37 votes, the result is: Xiaohong gets 15 votes, Xiaoming gets 10 votes, and Xiaohua gets 12 votes: How much more can Xiaoming get? votes to ensure that the most votes will be elected monitor.
从49名学生中选一名班长，小红、小明和小华为候选人，统计37张选票后的结果是：小红得15票，小明得10票，小华得12票：小明至少再得多少票才能保证以票数最多当选班长．
<gadget id="calculator">49 - 37 - 6</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">49 - 37 - 3</gadget>
<output>9</output>

<result>9</result>