The combined age of the two brothers is 30 years old this year. When the elder brother is as old as the younger brother is now, the younger brother's age is exactly half of the elder brother's age. How old is the elder brother this year?
兄弟俩今年的年龄和是30岁，当哥哥像弟弟现在这样大时，弟弟的年龄恰好是哥哥年龄的一半，哥哥今年几岁？
<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>