If the angle ratio of the three angles of a triangle is 2:3:5, what is the largest angle in the triangle?
若一个三角形的三个角的度数比是2：3：5，那么这个三角形中最大的角为多少度．
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">180 * (1/2)</gadget>
<output>90</output>

<result>90</result>