If there are 7 boys less than 3/5 of the whole class in a certain class, and 2 girls more than 50% of the whole class, how many fewer boys are there than girls in this class?
某班的男生是全班人数的(3/5)少7人，女生是全班人数的50%多2人，那么，这个班男生比女生少多少人．
<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<gadget id="calculator">50 * (3/5)</gadget>
<output>30</output>

<gadget id="calculator">30 - 7</gadget>
<output>23</output>

<gadget id="calculator">50 - 23 - 23</gadget>
<output>4</output>

<result>4</result>