The younger brother has 17 yuan, and the elder brother has 25 yuan. After the elder brother gives the younger brother the amount of money, the younger brother's money is twice as much as the elder brother's.
弟弟有钱17元，哥哥有钱25元，哥哥给弟弟多少元后，弟弟的钱是哥哥的2倍．
<gadget id="calculator">17 + 25</gadget>
<output>42</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">42 / 3</gadget>
<output>14</output>

<gadget id="calculator">25 - 14</gadget>
<output>11</output>

<result>11</result>