数学题:某班在植树活动中
- 时间:2020-05-13 15:05:48
- 分类:数学世界
- 阅读:157 次
数学题:某班在植树活动中,平均每人植树7.5棵,若男女分开计算,则男生平均植树9棵,女生平均植树5棵,该班男生占全班人数的( )%。怎么写?
数学题解答:此题可用设数法,结合方程来解决。
把全班人数看作“1”,男生设为x。则有
[9x + (1-x)×5]÷1=7.5
4x+5=7.5
x=0.625
男生占总人数的:0.625÷1=62.5%
答:该班男生占全班人数的( 62.5)%。
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