Add 6 to the former term of 3:7, to keep the ratio unchanged, how much should the latter term be multiplied by
把3：7的前项加上6，要使比值不变，后项应该乘以多少
<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>