Dongdong has 25 pencils. After giving Mingming 6, they have the same number of pencils. How many pencils did Mingming have?
东东有25支铅笔，送给明明6支后，他们的铅笔数就同样多了，明明原来有多少支铅笔？
<gadget id="calculator">25 - 6 - 6</gadget>
<output>13</output>

<result>13</result>