In a tree planting activity in a certain class, each person planted 7.5 trees on average. If male and female students were calculated separately, the average number of boys planted 9 trees per person, and the average number of girls planted 5 trees. how many).
某班在一次植树活动中，平均每人植树7.5棵，若男女生分别计算，则男生平均每人植树9棵，女生平均每人植树5棵，该班男生占全班人数的多少(几分之几)．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>