The sum of the older brother's age 5 years later and the younger brother's age 3 years ago is 29 years old, and the younger brother's age this year is 4 times the age difference between the two. How old is brother?
哥哥5年后的年龄与弟弟3年前的年龄和是29岁，弟弟今年的年龄是两人年龄差的4倍．哥哥今年多少岁？
<gadget id="calculator">4 * 27</gadget>
<output>108</output>

<gadget id="calculator">27 + 108</gadget>
<output>135</output>

<gadget id="calculator">1 + 4 + 4</gadget>
<output>9</output>

<gadget id="calculator">135 / 9</gadget>
<output>15</output>

<result>15</result>