What did he put in the barrel?
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A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it.
Now the barrel weighs less than 100 pounds. What did he put in the barrel?
Put a “HOLE” in the barrel, its weight will automatically reduced.
He removed few gallons of oil and now barrel is filled with AIR+remaining oil. Hence, weighs less.
He puts something into the barrel with a lower density than oil. The oil will spill out of the barrel and the whole contraption weighs less than before. A big block of wood would do the trick.
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