How many birds were Flying?
x = some birds flying
x + (x/2) + 1 = 100
(2x + x)/2 = 99
3x = 198
x = 66
1st answer:
Total birds flying = x = 66
That is, if the bird who greeted them hello is just resting and not flying.
2nd answer:
Total birds flying = some birds + another flying bird who greeted them “hello"
Total birds flying = 66 + 1 = 67