The complement of an angle is 30° less than (1/2) of this angle, please calculate the size of this angle.
一个角的余角比这个角的(1/2)少30°，请你计算出这个角的大小．
<gadget id="calculator">90 + 30</gadget>
<output>120</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + 1</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">120 / (3/2)</gadget>
<output>80</output>

<result>80</result>