Find out the missing number in the picture attached:

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What is the centre of gravity?

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?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What is more useful when it is broken?

Which city is three-fifths chick two third cat and 50% goat?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?