If 9 is added to the last term of the first ratio in the ratio 5:6=10:12, how much should be added to the last term of the second ratio to make the ratio still valid.
如果比例5：6=10：12中第一个的后项加上9，那么第二个比的后项应该加上多少才能使比例仍然成立．
<gadget id="calculator">18 * 10</gadget>
<output>180</output>

<gadget id="calculator">180 / 5</gadget>
<output>36</output>

<gadget id="calculator">36 - 12</gadget>
<output>24</output>

<result>24</result>