Li Ming is 6 years old this year, and Uncle Wang is 26 years old. How many years later, Uncle Wang will be three times the age of Li Ming.
今年李明6岁，王叔叔是26岁，问多少年以后，王叔叔的年龄是李明年龄的3倍．
<gadget id="calculator">26 - 6</gadget>
<output>20</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<result>4</result>