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The correct answer is F. Tanks D, E & G will never fill up because the input pipe for D is blocked. So C will start filling J. It will only start filling up if & when J fills up, before which L will start filling up instead of I because water is traveling up as opposed to down to L. The water from L flows into pipes leading to F & H, but H won’t fill up because it’s input pipe is blocked. Therefore, tank F will fill up first.