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36. let the total number of deers be X.
deers grazing= X/2
deers playing nearby = 3/4 * X/2
= 3x / 8
rest deers drinking water = 9
therefore ,
x/2 + 3x/8 + 9 = X
4x/8 + 3x/8 + 72/8 = X
(7x + 72)/8 = X
7x +72 = 8x
72 = 8x - 7x
72 = X
therefore total number of deers in the herd is 72
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