If the ratio of the three interior angles of a triangle is 2:3:4, then how many degrees is the largest angle greater than the smallest angle?
如果一个三角形的三个内角度数的比是2：3：4，那么最大的角比最小的角多多少度．
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">180 * (4/9)</gadget>
<output>80</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">180 * (2/9)</gadget>
<output>40</output>

<gadget id="calculator">80 - 40</gadget>
<output>40</output>

<result>40</result>