The number of girls in class one every five years is (5/7) of the number of boys, and the number of boys is equivalent to ((())/(())) of the whole class.
五年一班女生人数是男生人数的(5/7)，男生人数相当于全班人数的((())/(()))．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">7 * (5/7)</gadget>
<output>5</output>

<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>