Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What has a bottom at the top?

Find the next number in the sequence

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

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I’m tall when I’m young, and I’m short when I’m old. What am I?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

What is the end of everything?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?