Mom is 40 years old this year. Xiaohong's age is her mother's (3/10) and her grandmother's (1/6). How old is Xiaohong's grandmother this year?
妈妈今年40岁，小红的年龄是妈妈的(3/10)，又正好是外婆的(1/6)，小红的外婆今年几岁？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(3/10) / (1/6)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">40 * (9/5)</gadget>
<output>72</output>

<result>72</result>