Question 110134
Let x=number of geese in the original flock
At one pm, x/5 fly away 
and at one pm, we have left x-x/5=4x/5 geese
At two pm (1/8)(4x/5) or(4x/40) or (x/10) fly away-------------Now I'm assuming that you mean 1/8 of the geese that are left
At two pm, (4x/5)-(x/10) or (8x/10)-(x/10) or 7x/10 geese are left

At three pm, 3*(x/5) flew away that means that
At three pm, (7x/10)-(3x/5) or (7x/10)-6x/10) or x/10 geese are left and we are told that this equals 28.--------------So:

x/10=28  multiply both sides by 10
x=280-----------------------------------number of geese in the original flock

CK
at one pm, 280/5 or 56 geese flew away leaving 280-56 or 224

at two pm 224/8 or 28 geese flew away leaving 224-28 or 196

At three pm 3*56 or 168 geese flew away leaving 196-168 or 28

Hope this helps---ptaylor