The sum of the ages of Li, Sun and Wang this year is 113 years old. When Wang is 38 years old, Sun is twice as old as Li. When Li is 17 years old, Wang is twice as old as Sun. How old is Sun this year?
李、孙、王三人今年年龄之和为113岁，王38岁时，孙的年龄是李的2倍，李17岁时，王的年龄是孙的2倍，孙今年多少岁．
<gadget id="calculator">25 + 7</gadget>
<output>32</output>

<result>32</result>