The number of boys in Qianjin Primary School is 25 less than the number of the whole school (4/7), and the number of girls is 15 more than the number of the whole school (4/9). What is the total number of people in the school?
前进小学男生人数比全校人数的(4/7)少25人，女生人数比全校人数的(4/9)多15人，全校总人数是多少人．
<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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

<gadget id="calculator">(4/9) - 1</gadget>
<output>-5/9 = around -0.555556</output>

<gadget id="calculator">(4/7) + (-5/9)</gadget>
<output>1/63 = around 0.015873</output>

<gadget id="calculator">10 / (1/63)</gadget>
<output>630</output>

<result>630</result>