To keep the value of the fraction (5/6) unchanged, the numerator is increased by 10, and the denominator should be increased by how much.
要使分数(5/6)的值不变，分子增加10，分母应增加多少．
<gadget id="calculator">5 + 10</gadget>
<output>15</output>

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

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<result>12</result>