3:6=12:24, if the inner term 6 is enlarged by 3 times, how much should the outer term 3 become so that the ratio still holds.
3：6=12：24，如果内项6扩大3倍，外项3应变成多少，才能使比例仍然成立．
<gadget id="calculator">12 * 6 * 3</gadget>
<output>216</output>

<gadget id="calculator">216 / 24</gadget>
<output>9</output>

<result>9</result>