Prove that the below maths equation is true.

8 + 8 = 91

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

What's the only room from which no one can enter or leave

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Identify The phrase in the picture.

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

What does the below image rebus riddle means ?