The average age of Xiaohong, father, and mother is 32 years old. It is known that the average age of father and mother is 42 years old. How old is Xiaohong?
小红、爸爸、妈妈三人的平均年龄是32岁，已知爸爸、妈妈的平均年龄是42岁，小红是多少岁．
<gadget id="calculator">32 * 3</gadget>
<output>96</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">96 - 84</gadget>
<output>12</output>

<result>12</result>