The number of girls in Class 1 was originally the number of the whole class (2/11), and later 4 girls were transferred, and the number of girls was now the number of the whole class (1/4). How many boys were there in this class?
六一班原来女生人数是全班人数的(2/11)，后来又转来4个女生，这时女生人数是全班人数的(1/4)，这个班原有男生多少人？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">11 - 2</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">4 / (1/9)</gadget>
<output>36</output>

<result>36</result>