The students do exercises and line up in a square team. Counting from the front, back, left and right, Xiaohong is the fifth. Ask how many people there are in total.
同学们做操，排成一个正方形的队伍，从前、后、左、右数，小红都是第5个，问一共有多少人．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

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

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>