Add 28 to the former term of 7:8, how much should the latter term be multiplied to keep the ratio unchanged.
给7：8的前项加上28，要使比值不变，后项应该乘多少．
<gadget id="calculator">7 + 28</gadget>
<output>35</output>

<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<result>5</result>