设这总数为X,
则X(45%-15%)=72
X=72/(45%-15%)
X=72/(30%)
X=72/0.3
X=720/3
X=240
猪=45%*240=45*2.4=90+18=108
牛=15%*240=15*2.4=30+6=36
羊=35%*240=35*2.4=70+14=84
马=5%*240=5*2.4=12
设这总数为X,
则X(45%-15%)=72
X=72/(45%-15%)
X=72/(30%)
X=72/0.3
X=720/3
X=240
猪=45%*240=45*2.4=90+18=108
牛=15%*240=15*2.4=30+6=36
羊=35%*240=35*2.4=70+14=84
马=5%*240=5*2.4=12