I have branches, but no fruit, trunk or leaves. What am I?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

When is the top of a mountain similar to a savings account?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

I have no life, but I can die. What am I?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What is next number in the pattern below:

131 517 192 123 ?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?