In a class, there are twice as many boys as girls, and the number of girls is equal to the number of the whole class.
某班男生是女生的1倍，女生人数是全班人数的多少．
<gadget id="calculator">1 + 1</gadget>
<output>2</output>

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

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