Now, let’s solve it step by step. When you carefully observe the flow of coffee and the system of pipes with all its branches, you’ll spot those blockages clearly marked (shown by red circles in the image). As a result, cups 4, 9, and 7 are out of the running since coffee can’t get to them.
That leaves us with cup 5. It’s the only cup where the coffee can freely flow in and fill up first. So, the correct answer is cup 5.
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