桃树:梨树=4/9:3/5=20:27桃树141x20/47=60棵梨树141x27/47=81棵
设桃树有x棵,则梨树有(141-x)棵。x*3/5=(141-x)*4/9解得x=60所以桃树有60棵,梨树有141-60=81棵