2, 4, 6, 8, 10, these numbers are even numbers, what is the sum of all even numbers smaller than 101?
2、4、6、8、10，这些数都是双数，比101小的所有的双数的和是多少．
<gadget id="calculator">2 + 100</gadget>
<output>102</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">102 * 25</gadget>
<output>2_550</output>

<result>2_550</result>