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It can not be seen, it weights nothing but when put into a barrel, it makes it lighter. What is it?

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It can not be seen, it weights nothing but when put into a barrel, it makes it lighter. What is it?
posted Oct 31, 2016 by anonymous

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2 Answers

0 votes

If we assume that the barrel was filled with something to begin with, filling it with air will make it lighter.

answer Nov 1, 2016 by Tejas Naik
0 votes

result - a hole

answer Dec 8, 2018 by Deepak Chitragar



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