There is a pile of erasers, 4 of which are red, accounting for the whole (4/11), if one more red eraser is added, how much of the red eraser is the whole.
有一堆橡皮，其中4块是红色的，占整体的(4/11)，若再增加1块红色的橡皮，则红色橡皮占整体的多少．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">4 / (4/11)</gadget>
<output>11</output>

<gadget id="calculator">11 + 1</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>