Missing Digit Riddle

The centre of the third figure is empty. What digit should fit inside?

Missing Digit Riddle




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I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

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Which five letter word can be added at the end of below word to form a
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> Pin
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> Boiling
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A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

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Jigsaw puzzles

Jigsaw puzzles soared in popularity during the great depression, as they provided a cheap, long-lasting, recyclable form of entertainment.