Given that the ratio of the angles of the top and bottom angles of a triangle is 5:2:2, what is the top angle of this triangle?
已知三角形的顶角和底角的度数的比为5：2：2，这个三角形的顶角是多少度．
<gadget id="calculator">5 + 2 + 2</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">180 * (5/9)</gadget>
<output>100</output>

<result>100</result>