The mother is 24 years older than the son, and 2 years ago the mother was four times the son's age. What is the age of the son now?
妈妈比儿子的年龄大24岁，2年前妈妈的年龄是儿子年龄的4倍．儿子现在的年龄是多少岁．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<result>10</result>