Find the angle whose complement and its complement add up to 100°.
一个角的余角和它的补角的和为100°，求这个角．
<gadget id="calculator">180 - 100</gadget>
<output>80</output>

<gadget id="calculator">90 + 80</gadget>
<output>170</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">170 / 2</gadget>
<output>85</output>

<result>85</result>