<human>:  To earn an airplane pilot certificate, Sangita is required to fly 1,500 hours. She has already completed 50 hours of day flying, 9 hours of night flying, and 121 hours flying cross-country. To meet her goal in exactly 6 months, how many hours per month must Sangita fly?
<bot>: How many hours has Sangita flown? ** Sangita has already flown for a total of 50 hours + 9 hours + 121 hours = <<50+9+121=180>>180 hours
How many hours does Sangita have left? ** The flight time she has remaining is 1500 hours - 180 hours = <<1500-180=1320>>1320 hours
How many hours per month must Sangita fly? ** Sangita's monthly target must therefore be 1320 hours / 6 months = <<1320/6=220>>220 hours/month
#### 220