6. Boys in Class 2 account for 2/3 of the whole class. How many girls are boys in this class?
六2班男生占全班人数的(2/3)，这个班女生是男生人数的多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / (2/3)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>