Grandma is 65 years old this year, mother's age is grandma's (3/5), and Xiaohong's age is mother's (1/3). How old is Xiaohong?
奶奶今年65岁，妈妈的年龄是奶奶的(3/5)，小红的年龄是妈妈的(1/3)．小红今年多少岁？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">65 * (3/5) * (1/3)</gadget>
<output>13</output>

<result>13</result>