Grandpa is 72 years old this year, father's age is grandpa's (2/3), Xiao Ming's age is father's (1/4), how old is Xiao Ming this year.
爷爷今年72岁，爸爸的年龄是爷爷的(2/3)，小明的年龄是爸爸的(1/4)，小明今年多少岁．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">72 * (2/3) * (1/4)</gadget>
<output>12</output>

<result>12</result>