What is common among 11, 69, and 88?

What does this below rebus puzzle mean?

I have Rs.50 and I spend it in the way as below.

O_er_t_o_

Complete the missing letters of the given word.

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

How many letters are in the alphabet?

What does this Rebus Picture means ?

Solve the following series:
AZ, GT, MN, __, YB