My grandfather is 72 years old this year, my father's age is my grandfather's (5/9), and my age is my father's (3/10). How old am I?
爷爷今年72岁，爸爸年龄是爷爷的(5/9)，我的年龄是爸爸的(3/10)．我今年多少岁？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">72 * (5/9) * (3/10)</gadget>
<output>12</output>

<result>12</result>