Find the next number in the sequence

1, 2, 6, 21, 88, __?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

What type of tree can I carry in my hand?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

I am white when I am dirty, and black when I am clean. What am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What is black when you buy it, red when you use it, and gray when you throw it away?