In 4:7, if 16 is added to the former term of the ratio, if the ratio remains unchanged, how much should be added to the latter term.
在4：7中，如果比的前项加上16，要是比值不变，后项应加上多少．
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">35 - 7</gadget>
<output>28</output>

<result>28</result>