Now the older brother is exactly twice the age of the younger brother. And 9 years ago, the age of the older brother was 5 times the age of the younger brother, so how old is the older brother now?
现在哥哥的年龄恰好是弟弟年龄的2倍．而9年前哥哥的年龄是弟弟年龄的5倍，则哥哥现在的年龄是几岁？
<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<gadget id="calculator">45 - 9</gadget>
<output>36</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>