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Can anyone solve this Murder Mystery?

 
 
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Can anyone solve this Murder Mystery?
by Ian Horner - Wednesday, 20 May 2015, 9:15 PM
 

Two girls ate dinner together. They both ordered iced tea. One girl drank them very fast and had finished five in the time it took the other to drink just one. The girl who drank one died while the other survived. All of the drinks were poisoned. How did the girl who drank the most survive?