Students line up to do exercises, counting Xiaohong from the front is the 9th, counting from the back is the 8th Xiaohong, how many people are Xiaohong standing in this row.
同学们排队做操，从前面数小红在第9个，从后面数小红在第8个，小红站在这一列有多少人．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<result>16</result>