Add 8 to the former term of 2:5, how many times should the latter term be enlarged to keep the ratio unchanged.
2：5的前项加上8，要使比值不变，后项应扩大多少倍．
<gadget id="calculator">2 + 8</gadget>
<output>10</output>

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

<result>5</result>