设男生X人,女生Y人 1.62X+1.51Y/X+Y = 1.581.51X+1.51Y+0.11X/X+Y =1.58 1.51+ 0.11X/X+Y =1.580.11X/X+Y=0.07 11X/X+Y=711X=7X+7Y4X=7YX=7Y/4∴ X-Y=3Y/ 4 即男生比女生多3/4=75%
1.58-1.51=0.07 1.62-1.58=0.04(0.07-0.04)/0.04=75%
多3/7