设水果盘数x,瓜子盘数y,糖盘数z
x+y+z = 65
2x = 3y
4z = 2x
求得 x+2x/3+x/2=13x/6= 65->x = 30,y = 20,z = 15
所以总人数 = 2x=3y=4z =60人