Hope that the number of boys in Class 6, Class 1 of Primary School (2/3) is equal to the number of people in the class (4/13). There are 28 girls in this class, how many boys are there?
希望小学六1班男生人数的(2/3)等于全班人数的(4/13)，该班有女生28人，男生有多少人．
<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/13) / (2/3)</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">1 - (6/13)</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">28 / (7/13)</gadget>
<output>52</output>

<gadget id="calculator">52 - 28</gadget>
<output>24</output>

<result>24</result>