Xiao Ming and some classmates line up to play games, the students on Xiao Ming's left account for 70% of the total, and the students on Xiao Ming's right account for 20% of the total. Counting from left to right, what is Xiao Ming's rank?
小明和一些同学排成一队做游戏，排在小明左边的同学占总数的70%，排在小明右边的同学占总数的20%．从左往右数，小明排在第多少个．
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (7/10) - (1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<gadget id="calculator">10 * (7/10)</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>