Grandpa is 66 years old this year, 5 times younger than grandson by 4 years. How old is grandson?
爷爷今年66岁，是孙子年龄的5倍小4岁，孙子今年几岁？
<gadget id="calculator">66 + 4</gadget>
<output>70</output>

<gadget id="calculator">70 / 5</gadget>
<output>14</output>

<result>14</result>