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Soft Water or Hard Water?

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#27921
Fun:*** (2.58)
Difficulty:** (1.45)
Category:Science
Submitted By:metallicman*us***

 

 

 



Two friends, Fred and Liz, were having a fun night out. They went to the bowling alley, bowled for a while, went to the bar, then left. They went to Liz's apartment, at which Fred had never been before. Out of the blue Fred said, "How much do you want to bet I can figure out, without guessing, if the water in your apartment is hard water or soft water?" Liz thought to herself and decided he wouldn't be able to tell, so she bet him twenty dollars. They bought some cheap soap at the local gas station, and a minute after they got back to her apartment, he told her the water was soft. He was right, and Liz handed him a twenty dollar bill. How did he know it was soft water so fast?





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