There are 100 students in a certain grade, and the sum of their ages after ten years is 2000. What is the average age of these students now?
某年级学生共有100人，十年后他们岁数之和是2000，问现在这些同学的平均年龄是多少岁．
<gadget id="calculator">100 * 10</gadget>
<output>1_000</output>

<gadget id="calculator">2_000 - 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 100</gadget>
<output>10</output>

<result>10</result>