A bald-headed old man has three grandchildren, the eldest grandson is 22 years old, the second grandson is 20 years old, and the younger grandson is 15 years old. After 25 years, the sum of the ages of these three grandchildren will be 60 years less than twice the age of the old man at that time. How much is the old man now? age?
一白头老翁有三个孙子，长孙22岁，次孙20岁，小孙15岁，25年后，这三个孙子的年龄之和比老翁那时的年龄的2倍还少60岁，老翁现在多少岁？
<gadget id="calculator">2 * 25</gadget>
<output>50</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">22 + 25 + 20 + 25 + 15 + 25 + 10</gadget>
<output>142</output>

<gadget id="calculator">142 / 2</gadget>
<output>71</output>

<result>71</result>