Xiaoming's grandmother is 72 years old this year, his mother's age is his grandmother's (5/9), and Xiaoming's age is his mother's (7/20). How old is Xiao Ming?
小明的外婆今年72岁，妈妈的年龄是外婆的(5/9)，小明的年龄是妈妈的(7/20)．小明今年多少岁？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">72 * (5/9) * (7/20)</gadget>
<output>14</output>

<result>14</result>