If (1/5) of the number of boys in a school is equal to (1/4) of the number of girls, what is the percentage of boys in the whole school?
某校男生人数的(1/5)等于女生人数的(1/4)，男生人数占全校人数的多少
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>