If an angle is equal to 5 times its supplementary angle, what is the complement of the supplementary angle of this angle?
一个角等于它的补角的5倍，则这个角的补角的余角是多少．
<gadget id="calculator">180 - 150</gadget>
<output>30</output>

<gadget id="calculator">90 - 30</gadget>
<output>60</output>

<result>60</result>