Answer :
x is the original number of geese
1pm: (1/5)x fly away ----- remaining (4/5)x
2pm: (1/8) (4/5)x fly away ----- remaining (7/10)x
3pm: 3(1/5)x fly away -------- remaining (1/10)x
(1/10)x= 32
x=320
1pm: (1/5)x fly away ----- remaining (4/5)x
2pm: (1/8) (4/5)x fly away ----- remaining (7/10)x
3pm: 3(1/5)x fly away -------- remaining (1/10)x
(1/10)x= 32
x=320