Common Errors People Make When Solving
When trying to crack this puzzle, there are several typical mistakes that can result in the wrong answer. One common blunder is assuming that Cup 1 will fill first since it’s directly beneath the source. This might seem logical initially, but it fails to consider the blocked pipe that leads to Cup 1. Another error is completely disregarding the blockages in the pipes. Without taking these obstacles into account, it’s impossible to determine the correct answer. Moreover, many individuals make the mistake of relying on intuition to guess, rather than carefully tracing the flow of the liquid.

Step-by-Step Approach to Solving the Puzzle
If you’re having trouble determining which cup will fill first, don’t worry. Let’s solve this puzzle methodically.
Begin at the source from where the liquid is poured. The liquid starts flowing down the main pipe and then branches out in multiple directions. The first thing to do is to examine each branch meticulously to see where the flow can actually continue. Looking at Cup 1, we can observe that the pipe leading to it is blocked. This implies that no liquid can reach Cup 1, so it can’t be the first to fill. Next, we examine the path to Cup 2. Here too, we discover a blockage in the pipe, ruling out Cup 2 as a possibility.
Now, let’s turn our attention to Cup 3. The pipe leading to Cup 3 is unobstructed, allowing the liquid to flow directly into it without any hindrances. This makes Cup 3 the likely candidate to fill first. To confirm this, we check the remaining cups. The pipes leading to Cups 4, 5, 6, and 7 all have blockages, preventing the liquid from reaching them. After tracing all the possible paths, it becomes evident that Cup 3 is the only one that can fill.
The Solution: Cup 3 Will Fill First
After analyzing the diagram step by step, we can firmly state that Cup 3 will fill first. Its path is clear, while all the other cups are blocked by obstructions in their respective pipes.