In a certain class, girls accounted for 4/9 of the whole class in the first semester, and a girl was transferred in the next semester. At this time, the ratio of girls to boys is 5:6. How many students were there in this class last semester?
某班上学期女生占全班的(4/9)，下学期转来了一名女生，这时女生与男生的比是5：6．这个班上学期原有多少学生？
<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(5/6) - (4/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / (1/30) / (5/9)</gadget>
<output>54</output>

<result>54</result>