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A, B, C, and D are standing in a circle. A has $800$ mL of $100\%$ water in his glass. B, C, and D have $400$ mL, $200$ mL, and $100$ mL of water in their glasses, respectively.

 

A pours half of his water into B's glass and drinks half of what's left in his glass.

B then pours half of what's in her glass into C's glass and drinks half of what's left in her glass.

C then pours half of what's in his glass into D's glass and drinks half of what's left in his glass.

D then pours half of what's in her glass into A's glass and drinks half of what's left in her glass.

Lastly, all remaining beverages are poured into a big container.

 

The liquid in the big container then contains $x\%$ water. What is $x$?

 Oct 21, 2020
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Sorry, there is a typo, here is the corrected version:

 

 

 

A, B, C, and D are standing in a circle. A has 800 mL of  100% juice in his glass. B, C, and D have 400 mL, 200 mL, and 100 mL of water in their glasses, respectively.

 

A pours half of his juice into B's glass and drinks half of what's left in his glass.

B then pours half of what's in her glass into C's glass and drinks half of what's left in her glass.

C then pours half of what's in his glass into D's glass and drinks half of what's left in his glass.

D then pours half of what's in her glass into A's glass and drinks half of what's left in her glass.

Lastly, all remaining beverages are poured into a big container.

 

The liquid in the big container then contains x% juice. What is x?

 Oct 21, 2020

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