Half of a herd of deer are grazing in the field and three - fourths of the remaining are playing nearby. The rest 9 are drinking water from the pond. Find the number of deer in the herd.
Let the number of deer in the herd be x.
Number of those who are grazing = 
Remaining = 
Number of those who are playing =
⇒ 7x + 72 = 8x
x = 72
27