The grandfather is 54 years old this year, and the granddaughter is 2 years old this year. How many years later, the grandfather will be 5 times the age of the granddaughter.
爷爷今年54岁，孙女今年2岁，多少年后，爷爷的年龄是孙女的5倍．
<gadget id="calculator">54 - 2</gadget>
<output>52</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<gadget id="calculator">13 - 2</gadget>
<output>11</output>

<result>11</result>