Here’s another brain-teasing puzzle for you: can you figure out which cup fills up first?
Take a closer look, some of the cups are connected by pipes, while others have open bottoms. You’ll need to watch carefully and think it through to uncover the correct answer.

The water is flowing… six cups are connected…
But only one will fill up first.
Most people get this wrong.
Only someone with a sharp brain can crack it.
Which cup is it?
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Which Cup Fills Up First Answer
Correct answer is Cup ‘E’ fills up first.
Explanation:
The first thing to notice is that the cup handles are hollow.
Cup A has two openings: one through the handle and another on the opposite side. Because the handle opening is lower, water will flow through it first.
Water will flow through pipe to cup ‘E’. Cup ‘E’ has opening connecting to Cup ‘D’. But, Cup ‘D’ handle has no pass-through so water can’t reach into Cup ‘D’
Here is the picture showing which cup fills up first.

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