3000 new bees are born every day. In 7 days there will be 3000*7=<<3000*7=21000>>21000 new bees
If each day the queen loses 900 bees, in 7 days there will be 900*7=<<900*7=6300>>6300 fewer bees
If at the beginning the queen had 12500 bees, then at the end of 7 days she will have 12500+21000-6300=<<12500+21000-6300=27200>>27200 bees
The total number of bees in the hive including the queen is 27200+1 =<<27200+1=27201>>27201
#### 27201