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Since this question does not specify the depth of the pool it is unanswerable.
However, let us assume a depth of 5'.One gallon is equal to 0.134 cubic feet. To determine how many gallons are in a 15' x 36' x 5' pool, you must first determine how many cubic feet are in the pool.
To do this, multiply length x width x depth.
15 x 36 x 5 = 2700 cubic feet
To determine the number of gallons in this pool, simply divide 2700 by 0.134
2700/0.134 = 20149 gallons.
1 gallon 20149 gallon
-------- = ------------
0.134 cf 2700 cf
Note that this calculation is for US gallons.