Can you solve the maths in the below-given picture equation?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

What makes this number unique: 8,549,176,320?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6