The number of boys in a class is 4 less than the number of students in the whole class (5/9), and the number of girls is 6 more than 40% of the number of students in the class. How many fewer boys than girls in this class
某班的男生人数比全班学生人数的(5/9)少4人，女生人数比全班学生人数的40%多6人．那么这个班的男生人数比女生人数少多少人
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (5/9) - (2/5)</gadget>
<output>2/45 = around 0.044444</output>

<gadget id="calculator">2 / (2/45)</gadget>
<output>45</output>

<gadget id="calculator">45 * (5/9)</gadget>
<output>25</output>

<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">45 - 21 - 21</gadget>
<output>3</output>

<result>3</result>