Grandma is 65 years old this year, mother's age is grandma's (7/13), Xiaohong's age is 1 year younger than mother's age (2/7), how old is Xiaohong this year?
外婆今年65岁，妈妈的年龄是外婆的(7/13)，小红的年龄是妈妈年龄的(2/7)小1岁，小红今年几岁？
<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">65 * (7/13) * (2/7)</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>