The number of boys in the fifth grade of a certain school is the number of girls (4/5), and the number of boys is the number of the whole grade
某校五年级男生人数是女生人数的(4/5)，男生人数是全年级人数的多少
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(4/5) / (9/5)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>