3:4, if you add 9 to the former term of the ratio, how much will you multiply the latter term.
3：4，比的前项加上9，那么比的后项乘多少．
<gadget id="calculator">9 + 3</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<result>4</result>