Add 10 to the former term of (5/12), to keep the ratio constant, how much should be added to the latter term
把(5/12)的前项加上10，要使比值不变，后项应该加多少
<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

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

<result>24</result>