a total of x liters of pure acid were drawn off from a tank containing 729 liters of pure acid and were replaced by water . the result was thoroughly mixed to obtain a homogeneous solution and then another x liters of the solution were drawn off , and again replaced by water, and again thoroughly mixed . this procedure was performed six times and the tank then contained 64 litres of pure acid . determine x
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a total of x litres of pure acid were drawn from a tank containing
a total of x liters of pure acid were drawn off from a tank containing 729 liters of pure acid and were replaced by water . the result was thoroughly mixed to obtain a homogeneous solution and then another x liters of the solution were drawn off , and again replaced by water, and again thoroughly mixed . this procedure was performed six times and the tank then contained 64 litres of pure acid . determine x