A certain school organizes students to participate in a mathematics competition. The number of girls participating in the competition is 90% of that of boys. If there are 9 more girls participating, the number of boys is less than that of girls (1/6). How many girls are participating in the competition?
某校组织学生参加数学竞赛，参加的学生中女生人数是男生的90%，如果女生再有9人参加，则男生人数比女生少(1/6)，参加竞赛的女生有多少人？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / (5/6)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(6/5) - (9/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">9 / (3/10)</gadget>
<output>30</output>

<gadget id="calculator">30 * (9/10)</gadget>
<output>27</output>

<result>27</result>