There are 50 students in Class 1, of which boys are girls (2/3), and girls are the number of the whole class.
六一班共有50人，其中男生是女生的(2/3)，女生是全班人数的多少．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

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

<result>3/5 = around 0.6</result>