Class 6 has 49 students, the number of boys is 3/4 of that of girls, how many fewer boys than girls?
六①班有49人，男生人数是女生的(3/4)，男生比女生少多少人．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">49 / (7/4)</gadget>
<output>28</output>

<gadget id="calculator">49 - 28</gadget>
<output>21</output>

<gadget id="calculator">28 - 21</gadget>
<output>7</output>

<result>7</result>