If 5 is the middle term in the ratio of x to 10, then x = how much.
如果5是x和10的比例中项，那么x=多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>