When doing morning exercises, the children line up in a row. From the front, Xiao Wang is ranked 4th, and from the back, Xiao Qing is ranked 5th. It is known that Xiao Wang is in front of Xiao Qing. How many students are there in this row?
做早操时，小朋友排成一列，从前数小王排第4，从后数小青排第5，已知小王排在小青的前面，这一列同学共有多少人．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<result>9</result>