Calculation: 11+13+15+17+...+97+99=how much.
计算：11+13+15+17+…+97+99=多少．
<gadget id="calculator">11 + 99</gadget>
<output>110</output>

<gadget id="calculator">99 - 11</gadget>
<output>88</output>

<gadget id="calculator">88 / 2</gadget>
<output>44</output>

<gadget id="calculator">44 + 1</gadget>
<output>45</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">110 * (45/2)</gadget>
<output>2_475</output>

<result>2_475</result>