Fatty is 12 years younger than his cousin. In four years, Fatty will be half the age of his cousin. What is the sum of their ages this year?
小胖比他的表姐小12岁，再过4年小胖的年龄是他表姐年龄的一半，他俩今年的年龄总和是多少岁．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">8 + 8 + 12</gadget>
<output>28</output>

<result>28</result>