The ages of A, B, C, and D are integers from the largest to the smallest. A and B are 33 years old, and B and C are 28 years old. Two years ago, the sum of the ages of A, B, and C was 5 times that of Ding's age. Times, so how old is Ding this year?
甲、乙、丙、丁四个人年龄为从大到小的整数，甲、乙共33岁，乙、丙共28岁，2年前，甲、乙、丙三人年龄和是丁年龄的5倍，那么丁今年多少岁．
<gadget id="calculator">33 - 4</gadget>
<output>29</output>

<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<gadget id="calculator">29 + 24</gadget>
<output>53</output>

<gadget id="calculator">53 - 13</gadget>
<output>40</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<result>10</result>