The sum of the current ages of the older brother and the younger brother is 45 years old. When the older brother is the younger brother's current age, and the younger brother's age is half of the older brother's age, then how old is the older brother.
哥哥和弟弟现在的年龄的和是45岁，当哥哥为弟弟现在的年龄时，弟弟的年龄为哥哥年龄的一半，则哥哥现在多少岁．
<gadget id="calculator">2 * 45</gadget>
<output>90</output>

<gadget id="calculator">90 - 45</gadget>
<output>45</output>

<gadget id="calculator">90 + 45</gadget>
<output>135</output>

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

<gadget id="calculator">2 + 2 + 1</gadget>
<output>5</output>

<gadget id="calculator">135 / 5</gadget>
<output>27</output>

<result>27</result>