The denominator of (3/5) is increased by 5, how much should the numerator be increased to keep the fraction size constant
(3/5)的分母增加5，要使分数大小不变，分子应增加多少
<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<result>3</result>