Xiao Ming and Xiao Hua each have some pencils. Xiaoming said to Xiaohua: "If you give me 2 pencils, then we have the same number of pencils." Xiaohua said to Xiaoming, "If you give me 4 pencils, then I have twice as many pencils as you "Then how many pencils does Xiao Ming have?"
小明和小华各有一些铅笔．小明对小华说："如果你给我2支铅笔，那么我们就有同样多的铅笔了．"小华对小明说"如果你给我4支铅笔，那么我的铅笔数就是你的两倍．"那么小明原有多少支铅笔．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">8 + 4 + 4</gadget>
<output>16</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">16 / 1</gadget>
<output>16</output>

<result>16</result>